NNCategoryPro
组件化核心模块,通过类别方式极大的扩展基础类功能
一. 崩溃保护NSObject+CashProtector.h
二. Objective-C 高阶函数实现/自定义
NSArray 高阶函数：
NS_ASSUME_NONNULL_BEGIN
@interface NSArray<ObjectType> (Helper)
/**
map 高阶函数(使用时需要将obj强转为数组元素类型)
*/
- (NSArray *)map:(id (NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx))block;
/**
filter 高阶函数(使用时需要将obj强转为数组元素类型)
*/
- (NSArray *)filter:(BOOL(NS_NOESCAPE ^)(ObjectType obj, NSUInteger idx))block;
/**
reduce 高阶函数(求和,累加等)
*/
- (NSNumber *)reduce:(NSNumber *)initial block:(NSNumber *(NS_NOESCAPE ^)(NSNumber *result, NSNumber *obj))block;
@implementation NSArray (Helper)
- (NSArray *)map:(id (NS_NOESCAPE ^)(id obj, NSUInteger idx))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableArray *marr = [NSMutableArray array];
[self enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
id value = block(obj, idx);
if (value) {
[marr addObject:value];
}
}];
// DDLog(@"%@->%@", self, marr.copy);
return marr.copy;
}
- (NSArray *)compactMap:(id (NS_NOESCAPE ^)(id obj, NSUInteger idx))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableArray *marr = [NSMutableArray array];
[self enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
id value = block(obj, idx);
if ([value isKindOfClass:NSArray.class]) {
[marr addObjectsFromArray:value];
} else {
[marr addObject:value];
}
}];
// DDLog(@"%@->%@", self, marr.copy);
return marr.copy;
}
- (NSArray *)filter:(BOOL(NS_NOESCAPE ^)(id obj, NSUInteger idx))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableArray *marr = [NSMutableArray array];
[self enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
if (block(obj, idx) == true) {
[marr addObject:obj];
}
}];
return marr.copy;
}
- (NSNumber *)reduce:(NSNumber *)initial block:(NSNumber *(NS_NOESCAPE ^)(NSNumber *result, NSNumber *obj))block{
if (!block) {
NSParameterAssert(block != nil);
return initial;
}
__block NSNumber *value = initial;
[self enumerateObjectsUsingBlock:^(NSNumber *_Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
value = block(value, obj);
}];
return value;
}
🌰🌰🌰：
1. 截取子字符串
NSArray<NSString *> *list = @[@"1111", @"2222", @"3333", @"4444"];
NSArray *listOne = [list map:^id * _Nonnull(NSString * _Nonnull obj, NSUInteger idx) {
return [obj substringToIndex:idx];
}];
// listOne_(, 2, 33, 444,)
2. 抽取模型数组对应属性（值为nil则返回对应模型）
NSMutableArray * marr = [NSMutableArray array];
for (NSInteger i = 0; i < 5; i++) {
WHKNetInfoFeedModel * model = [[WHKNetInfoFeedModel alloc]init];
model.category = [NSString stringWithFormat:@"name_%@", @(i)];
model.vendor = [NSDateFormatter stringFromDate:NSDate.date format:kFormatDate];
[marr addObject:model];
}
NSArray *listTwo = [marr map:^id * _Nonnull(id _Nonnull obj, NSUInteger idx) {
return [obj valueForKey:@"category"] ? : @"";
}];
// listTwo_( name_0, name_1, name_2, name_3, name_4, )
3.修改数组模型属性值
NSArray *listThree = [marr map:^id * _Nonnull(NSObject * _Nonnull obj, NSUInteger idx) {
[obj setValue:@(idx) forKey:@"category"];
return obj;
}];
// listThree_(model.category = @(0), model.category = @(1), model.category = @(2), model.category = @(3), model.category = @(4));
4. 过滤大约@“222”的元素
NSArray *listTwo = [list filter:^BOOL(id * _Nonnull obj, NSUInteger idx) {
return [(NSString *)obj compare:@"222" options:NSNumericSearch] == NSOrderedDescending;
}];
// listTwo_( 333, 444, )
5. 过滤不等于@“222”的元素
NSArray *list2 = [list filter:^BOOL(id * _Nonnull obj, NSUInteger idx) {
return (![(NSString *)obj isEqualToString:@"222"]);
}];
// list2_(111,333,444,)
6. array = @[@1, @3, @5, @7, @9];
NSNumber *result = [array reduce:@(0) block:^NSNumber * _Nonnull(NSNumber * _Nonnull result, NSNumber * _Nonnull obj) {
return @(num1.floatValue * 10 + num2.floatValue);
}];
// result_13579
NSNumber *result1 = [array reduce:@(0) block:^NSNumber * _Nonnull(NSNumber * _Nonnull result, NSNumber * _Nonnull obj) {
return @(num1.floatValue + num2.floatValue);
}];
// result1_25
NSDictionary 高阶函数：
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface NSDictionary<KeyType, ObjectType> (Helper)
/**
map 高阶函数
*/
- (NSDictionary *)map:(NSDictionary *(NS_NOESCAPE ^)(KeyType key, ObjectType obj))block;
/**
filter 高阶函数
*/
- (NSDictionary *)filter:(BOOL (NS_NOESCAPE ^)(KeyType key, ObjectType obj))block;
/**
compactMapValues 高阶函数
*/
- (NSDictionary *)compactMapValues:(id (NS_NOESCAPE ^)(ObjectType obj))block;
@end
@implementation NSDictionary(Tmp)
- (NSDictionary *)map:(NSDictionary *(NS_NOESCAPE ^)(id key, id obj))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableDictionary *mdic = [NSMutableDictionary dictionary];
[self enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
NSDictionary *value = block(key, obj);
if (value) {
[mdic addEntriesFromDictionary:value];
}
}];
return mdic.copy;
}
- (NSDictionary *)filter:(BOOL (NS_NOESCAPE ^)(id key, id obj))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableDictionary *mdic = [NSMutableDictionary dictionary];
[self enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
if (block(key, obj) == true) {
mdic[key] = obj;
}
}];
return mdic.copy;
}
- (NSDictionary *)compactMapValues:(id (NS_NOESCAPE ^)(id obj))block{
if (!block) {
NSParameterAssert(block != nil);
return self;
}
__block NSMutableDictionary *mdic = [NSMutableDictionary dictionary];
[self enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
id value = block(obj);
if (value) {
mdic[key] = value;
}
}];
return mdic.copy;
}
🌰🌰🌰：
- (void)funtionMoreDic{
NSDictionary<NSString *, NSString *> *dic = @{
@"1": @"111",
@"2": @"222",
@"3": @"222",
@"4": @"444",
};
NSDictionary *dic1 = [dic map:^NSDictionary * _Nonnull(NSString * _Nonnull key, NSString * _Nonnull obj) {
return @{[key stringByAppendingFormat:@"%@", @"_"] : [obj stringByAppendingFormat:@"%@", @"_"],
};
}];
DDLog(@"dic1_%@",dic1);
// 2020-07-03 06:20:05.248000+0000【line -305】-[TestViewController funtionMoreDic] dic1_{
// 2_ = 222_;
// 4_ = 444_;
// 1_ = 111_;
// 3_ = 222_;
// }
NSDictionary *dic2 = [dic compactMapValues:^id _Nonnull(NSString * _Nonnull obj) {
return [NSString stringWithFormat:@"%@_", obj];
}];
DDLog(@"dic2_%@",dic2);
// 2019-08-26 18:54:36.503000+0800【line -303】-[TestViewController funtionMoreDic] dic1_{
// 3 = 222_;
// 1 = 111_;
// 4 = 444_;
// 2 = 222_;
// }
NSDictionary *dic3 = [dic filter:^BOOL(NSString * _Nonnull key, NSString * _Nonnull obj) {
return [key isEqualToString:@"2"];
}];
DDLog(@"dic3_%@",dic3);
// 2019-08-26 18:54:36.504000+0800【line -304】-[TestViewController funtionMoreDic] dic2_{
// 2 = 222;
// }
NSDictionary *dic4 = [dic filter:^BOOL(NSString * _Nonnull key, NSString * _Nonnull obj) {
return [obj isEqualToString:@"222"];
}];
DDLog(@"dic4_%@",dic4);
// 2019-08-26 18:54:36.504000+0800【line -305】-[TestViewController funtionMoreDic] dic3_{
// 3 = 222;
// 2 = 222;
// }
}
三. 界面
在 UIView 分类添加方法
/**
给所有自视图加框
*/
- (void)getViewLayer{
NSArray *subviews = self.subviews;
if (subviews.count == 0) return;
for (UIView *subview in subviews) {
subview.layer.borderWidth = kW_LayerBorder;
#if DEBUG
subview.layer.borderColor = UIColor.redColor.CGColor;
#else
subview.layer.borderColor = UIColor.clearColor.CGColor;
#endif
[subview getViewLayer];
}
}
//使用方法:
[self.view getViewLayer];
子视图动态化布局
- (NSArray<__kindof UIView *> *)updateItems:(NSInteger)count aClassName:(NSString *)aClassName handler:(void(^)(__kindof UIView *obj))handler {
if (count == 0) {
return @[];
}
Class cls = NSClassFromString(aClassName);
NSArray *list = [self.subviews filter:^BOOL(UIView * obj, NSUInteger idx) {
return [obj isKindOfClass:cls.class];
}];
if (list.count == count) {
[list enumerateObjectsUsingBlock:^(UIView * obj, NSUInteger idx, BOOL * _Nonnull stop) {
if (handler) {
handler(obj);
}
}];
return list;
}
for (UIView *view in self.subviews) {
[view removeFromSuperview];
}
NSMutableArray *marr = [NSMutableArray array];
for (NSInteger i = 0; i < count; i++) {
UIView *subview = [[cls alloc]init];
subview.tag = i;
[self addSubview:subview];
[marr addObject:subview];
if (handler) {
handler(subview);
}
}
return marr;
}
- (NSArray<__kindof UIButton *> *)updateButtonItems:(NSInteger)count aClassName:(NSString *)aClassName handler:(void(^)(__kindof UIButton *obj))handler {
return [self updateItems:count aClassName:aClassName handler:^(__kindof UIView * _Nonnull obj) {
if (![obj isKindOfClass:UIButton.class]) {
return;
}
// NSString *clsName = NSStringFromClass(obj.class);
UIButton *sender = (UIButton *)obj;
if (![sender titleForState:UIControlStateNormal]) {
sender.titleLabel.font = [UIFont systemFontOfSize:15];
NSString *title = [NSString stringWithFormat:@"%@%@", aClassName, @(obj.tag)];
[sender setTitle:title forState:UIControlStateNormal];
[sender setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
}
if (handler) {
handler(obj);
}
}];
}
手势回调
#pragma mak - -Recognizer
#pragma mak - -Recognizer
/**
手势 - 单指点击
*/
- (UITapGestureRecognizer *)addGestureTap:(void(^)(UITapGestureRecognizer *reco))block{
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:nil action:nil];
recognizer.numberOfTapsRequired = 1;
recognizer.numberOfTouchesRequired = 1;
// recognizer.cancelsTouchesInView = false;
// recognizer.delaysTouchesEnded = false;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 长按
*/
- (UILongPressGestureRecognizer *)addGestureLongPress:(void(^)(UILongPressGestureRecognizer *reco))block forDuration:(NSTimeInterval)minimumPressDuration{
UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:nil action:nil];
recognizer.minimumPressDuration = minimumPressDuration;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 拖动
*/
- (UIPanGestureRecognizer *)addGesturePan:(void(^)(UIPanGestureRecognizer *reco))block{
UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:nil action:nil];
recognizer.minimumNumberOfTouches = 1;
recognizer.maximumNumberOfTouches = 3;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 边缘拖动
*/
- (UIScreenEdgePanGestureRecognizer *)addGestureEdgPan:(void(^)(UIScreenEdgePanGestureRecognizer *reco))block forEdges:(UIRectEdge)edges{
UIScreenEdgePanGestureRecognizer *recognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:nil action:nil];
recognizer.edges = edges;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 轻扫
*/
- (UISwipeGestureRecognizer *)addGestureSwipe:(void(^)(UISwipeGestureRecognizer *reco))block forDirection:(UISwipeGestureRecognizerDirection)direction{
UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:nil action:nil];
recognizer.direction = direction;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 捏合
*/
- (UIPinchGestureRecognizer *)addGesturePinch:(void(^)(UIPinchGestureRecognizer *reco))block{
UIPinchGestureRecognizer *recognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:nil action:nil];
// recognizer.scale = 1.0;
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
/**
手势 - 旋转
*/
- (UIRotationGestureRecognizer *)addGestureRotation:(void(^)(UIRotationGestureRecognizer *reco))block{
UIRotationGestureRecognizer *recognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:nil action:nil];
self.userInteractionEnabled = true;
self.multipleTouchEnabled = true;
[self addGestureRecognizer:recognizer];
[recognizer addActionBlock:block];
return recognizer;
}
四. 现金金额处理
NSNumber类型处理, 支持四舍五入
//
// NSNumberFormatter+Helper.m
// Location
//
// Created by BIN on 2017/12/21.
// Copyright © 2017年 Shang. All rights reserved.
//
#import "NSNumberFormatter+Helper.h"
#import <NNGloble/NNGloble.h>
NSString * const kNumIdentify = @"四舍五入";// 默认
NSString * const kNumIdentifyDecimal = @"分隔符,保留3位小数";
NSString * const kNumIdentifyPercent = @"百分比";
NSString * const kNumIdentifyCurrency = @"货币$";
NSString * const kNumIdentifyScientific = @"科学计数法 1.234E8";
NSString * const kNumIdentifyPlusSign = @"加号符号";
NSString * const kNumIdentifyMinusSign = @"减号符号";
NSString * const kNumIdentifyExponentSymbol = @"指数符号";
NSString * const kNumFormat = @"#,##0.00";
@implementation NSNumberFormatter (Helper)
static NSDictionary *_styleDic = nil;
+ (NSDictionary *)styleDic{
if (!_styleDic) {
_styleDic = @{
kNumIdentify: @(NSNumberFormatterNoStyle),
kNumIdentifyDecimal: @(NSNumberFormatterDecimalStyle),
kNumIdentifyPercent: @(NSNumberFormatterPercentStyle),
kNumIdentifyCurrency: @(NSNumberFormatterCurrencyStyle),
kNumIdentifyScientific: @(NSNumberFormatterScientificStyle),
};
}
return _styleDic;
}
+ (NSNumberFormatter *)numberIdentify:(NSString *)identify{
//使用当前线程字典来保存对象
NSMutableDictionary *threadDic = NSThread.currentThread.threadDictionary;
NSNumberFormatter *formatter = [threadDic objectForKey:identify];
if (!formatter) {
formatter = [[NSNumberFormatter alloc]init];
formatter.locale = [NSLocale localeWithLocaleIdentifier:kLanguageCN];
formatter.minimumIntegerDigits = 1;//最少小数点前的位数
formatter.minimumFractionDigits = 2;//最少小数点后的位数
formatter.maximumFractionDigits = 2;//最多小数点后的位数
formatter.roundingMode = NSNumberFormatterRoundUp;
//格式
if ([NSNumberFormatter.styleDic.allKeys containsObject:identify]) {
NSUInteger style = [NSNumberFormatter.styleDic[identify] unsignedIntegerValue];
if (style > 10 || style == 7) {
formatter.numberStyle = NSNumberFormatterNoStyle;
}
}
[threadDic setObject:formatter forKey:identify];
}
return formatter;
}
// 小数位数
+ (NSString *)fractionDigits:(NSNumber *)obj
min:(NSUInteger)min
max:(NSUInteger)max
roundingMode:(NSNumberFormatterRoundingMode)roundingMode{
NSNumberFormatter *formatter = [NSNumberFormatter numberIdentify:kNumIdentify];
formatter.minimumFractionDigits = min;//最少小数点后的位数
formatter.maximumFractionDigits = max;//最多小数点后的位数
formatter.roundingMode = roundingMode;
return [formatter stringFromNumber:obj] ? : @"";
}
// 小数位数
+ (NSString *)fractionDigits:(NSNumber *)obj{
NSString *result = [NSNumberFormatter fractionDigits:obj
min:2
max:2
roundingMode:NSNumberFormatterRoundUp];
return result;
}
+ (NSNumberFormatter *)positiveFormat:(NSString *)formatStr{
NSNumberFormatter *formatter = [NSNumberFormatter numberIdentify:kNumIdentifyDecimal];
formatter.positiveFormat = formatStr;
return formatter;
}
+ (NSNumberFormatter *)positive:(NSString *)formatStr
prefix:(NSString *)prefix
suffix:(NSString *)suffix
defalut:(NSString *)defalut{
NSNumberFormatter *formatter = [NSNumberFormatter numberIdentify:kNumIdentifyDecimal];
formatter.positivePrefix = prefix;
formatter.positiveSuffix = suffix;
formatter.usesGroupingSeparator = true; //分隔设true
formatter.groupingSeparator = @","; //分隔符
formatter.groupingSize = 3; //分隔位数
return formatter;
}
/// number为NSNumber/String
+ (NSString *)localizedString:(NSNumberFormatterStyle)nstyle number:(NSString *)number{
NSString *charSet = @"0123456789.";
NSCharacterSet *set = [[NSCharacterSet characterSetWithCharactersInString:charSet] invertedSet];
NSString *result = [[number componentsSeparatedByCharactersInSet:set] componentsJoinedByString:@""];
NSNumber *value = @([result floatValue]);
NSString *string = [NSNumberFormatter localizedStringFromNumber:value numberStyle:nstyle];
return string;
}
@end
五. 数组、字典防崩溃
//
// NSObject+Hook.m
// Xcode11Project
//
// Created by Bin Shang on 2020/7/4.
// Copyright © 2020 Bin Shang. All rights reserved.
//
#import "NSObject+Hook.h"
@implementation NSObject (Hook)
BOOL swizzleInstanceMethod(Class clz, SEL origSelector, SEL replSelector){
// NSLog(@"%@,%@,%@",self,self.class,object_getClass(self));
if (!clz || !origSelector || !replSelector) {
NSLog(@"Nil Parameter(s) found when swizzling.");
return NO;
}
//1. 通过class_getInstanceMethod()函数从当前对象中的method list获取method结构体，如果是类方法就使用class_getClassMethod()函数获取。
Method original = class_getInstanceMethod(clz, origSelector);
Method replace = class_getInstanceMethod(clz, replSelector);
if (!original || !replace) {
NSLog(@"Swizzling Method(s) not found while swizzling class %@.", NSStringFromClass(clz));
return NO;
}
if (class_addMethod(clz, origSelector, method_getImplementation(replace), method_getTypeEncoding(replace))) {
class_replaceMethod(clz, replSelector, method_getImplementation(original), method_getTypeEncoding(original));
} else {
method_exchangeImplementations(original, replace);
}
return YES;
}
BOOL SwizzleMethodClass(Class clz, SEL origSelector, SEL replSelector){
// NSLog(@"%@,%@,%@",self,self.class,object_getClass(self));
if (!clz || !origSelector || !replSelector) {
NSLog(@"Nil Parameter(s) found when swizzling.");
return NO;
}
clz = object_getClass(clz);
// Class metaClass = objc_getMetaClass(class_getName(clz));
Method original = class_getClassMethod(clz, origSelector);
Method replace = class_getClassMethod(clz, replSelector);
if (!original || !replace) {
NSLog(@"Swizzling Method(s) not found while swizzling class %@.", NSStringFromClass(clz));
return NO;
}
if (class_addMethod(clz, origSelector, method_getImplementation(replace), method_getTypeEncoding(replace))) {
class_replaceMethod(clz, replSelector, method_getImplementation(original), method_getTypeEncoding(original));
} else {
method_exchangeImplementations(original, replace);
}
return YES;
}
@end
@implementation NSArray (Hook)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
swizzleInstanceMethod(NSClassFromString(@"__NSArrayI"), @selector(objectAtIndex:), @selector(safe_objectAtIndex:));
swizzleInstanceMethod(NSClassFromString(@"__NSArrayI"), @selector(objectAtIndex:), @selector(safe_objectAtIndex:));
swizzleInstanceMethod(NSClassFromString(@"__NSArrayI"), @selector(objectAtIndexedSubscript:), @selector(safe_objectAtIndexedSubscript:));
NSArray *array = @[NSStringFromSelector(@selector(objectAtIndex:)),
NSStringFromSelector(@selector(objectAtIndexedSubscript:)),
NSStringFromSelector(@selector(insertObject:atIndex:)),
NSStringFromSelector(@selector(setObject:atIndexedSubscript:)),
NSStringFromSelector(@selector(insertObjects:atIndexes:))
];
for (NSString *str in array) {
swizzleInstanceMethod(NSClassFromString(@"__NSArrayM"),
NSSelectorFromString(str),
NSSelectorFromString([@"safe_" stringByAppendingString:str]));
}
});
}
- (id)safe_objectAtIndex:(NSUInteger)index {
NSUInteger count = self.count;
if (count == 0 || index >= count) {
return nil;
}
return [self safe_objectAtIndex:index];
}
- (id)safe_objectAtIndexedSubscript:(NSUInteger)index {
NSUInteger count = [(NSArray*)self count];
if (count == 0 || index >= count) {
return nil;
}
return [self safe_objectAtIndexedSubscript:index];
}
@end
@implementation NSMutableArray (Hook)
- (id)safe_objectAtIndex:(NSUInteger)index {
NSUInteger count = [(NSArray*)self count];
if (count == 0 || index >= count) {
return nil;
}
return [self safe_objectAtIndex:index];
}
- (id)safe_objectAtIndexedSubscript:(NSUInteger)index {
NSUInteger count = [(NSArray*)self count];
if (count == 0 || index >= count) {
return nil;
}
return [self safe_objectAtIndexedSubscript:index];
}
- (void)safe_insertObject:(id)anObject atIndex:(NSUInteger)index {
if (anObject == nil) return;
[self safe_insertObject:anObject atIndex:index];
}
- (void)safe_setObject:(id)obj atIndexedSubscript:(NSUInteger)idx {
if (obj == nil) return;
[self safe_setObject:obj atIndexedSubscript:idx];
}
- (void)safe_insertObjects:(NSArray *)objects atIndexes:(NSIndexSet *)indexes {
if (objects && objects.count == indexes.count) {
[self safe_insertObjects:objects atIndexes:indexes];
}
}
@end
@implementation NSDictionary (Hook)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
swizzleInstanceMethod(NSClassFromString(@"__NSDictionaryM"), @selector(setObject:forKeyedSubscript:), @selector(safe_setObject:forKeyedSubscript:));
swizzleInstanceMethod(NSClassFromString(@"__NSDictionaryM"),
@selector(setObject:forKey:),
@selector(safe_setObject:forKey:));
swizzleInstanceMethod(NSClassFromString(@"__NSDictionaryM"), @selector(removeObjectForKey:), @selector(safe_removeObjectForKey:));
});
}
- (void)safe_setObject:(id)anObject forKey:(id<NSCopying>)aKey {
if (anObject && aKey) {
[self safe_setObject:anObject forKey:aKey];
}
}
- (void)safe_setObject:(id)anObject forKeyedSubscript:(id<NSCopying>)aKey {
if (anObject && aKey) {
[self safe_setObject:anObject forKeyedSubscript:aKey];
}
}
- (void)safe_removeObjectForKey:(id)aKey {
if (aKey) {
[self safe_removeObjectForKey:aKey];
}
}
@end
UIViewConroller
///避免多个呈现造成的 app 崩溃
- (void)present:(BOOL)animated completion:(void (^ __nullable)(void))completion{
UIWindow *keyWindow = UIApplication.sharedApplication.delegate.window;
dispatch_async(dispatch_get_main_queue(), ^{
if ([self isKindOfClass:UIAlertController.class]) {
UIAlertController *alertVC = self;
if (alertVC.actions.count == 0) {
[keyWindow.rootViewController presentViewController:alertVC animated:animated completion:^{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(kDurationToast * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[alertVC dismissViewControllerAnimated:animated completion:completion];
});
}];
} else {
[keyWindow.rootViewController presentViewController:self animated:animated completion:completion];
}
} else {
[keyWindow.rootViewController presentViewController:self animated:animated completion:completion];
}
});
}
///判断是否从 cls 页面 push 过来
- (BOOL)pushFromVC:(Class)cls{
NSArray *viewControllers = self.navigationController.viewControllers;
if (viewControllers.count <= 1) {
return false;
}
NSInteger index = [viewControllers indexOfObject:self];
BOOL result = [viewControllers[index - 1] isKindOfClass:cls];
return result;
}
六.链式编程 ......