SFAspect
安装
pod 'SFAspect'实现原理
使用
- hook单个对象实例方法
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
BOOL animated = NO;
NSInvocation *invocation = aspectModel.originalInvocation;
//参数从2开始，因为方法执行的时候隐式携带了两个参数：self 和 _cmd，self是方法调用者，_cmd是被调用f方法的sel
[invocation getArgument:&animated atIndex:2];
NSLog(@"准备执行viewWillAppear,参数animated的值为%d",animated);
//改变参数
animated = NO;
[invocation setArgument:&animated atIndex:2];
}];
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"2" withPriority:0 withHookOption:(HookOptionAfter) withBlock:^(SFAspectModel *aspectModel, HookState state) {
BOOL animated = NO;
NSInvocation *invocation = aspectModel.originalInvocation;
//参数从2开始，因为方法执行的时候隐式携带了两个参数：self 和 _cmd，self是方法调用者，_cmd是被调用f方法的sel
[invocation getArgument:&animated atIndex:2];
NSLog(@"执行viewWillAppear后,参数animated的值为%d",animated);
//也可以通过invocation获取返回值，详情参考消息转发过程中NSInvocation的用法
}];
- hook单个对象的类方法
[self.vc hookSel:@selector(sayHiTo:withVCTitle:) withIdentify:@"3" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
NSLog(@"hook单个对象的类方法");
}];
//调用单个对象的类方法(如果直接用[ClassName sayHiTo:@"" withVCTitle:@""]这种方式不会触发hook)
[[self.vc class] sayHiTo:@"" withVCTitle:@""];
- hook类的所有对象的实例方法
[SFHookViewController hookAllClassSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
BOOL animated = NO;
NSInvocation *invocation = aspectModel.originalInvocation;
[invocation getArgument:&animated atIndex:2];
NSLog(@"准备执行viewWillAppear,参数animated的值为%d",animated);
}];
- hook类所有对象的类方法
[SFHookViewController hookAllClassSel:@selector(sayHiTo:withVCTitle:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
BOOL animated = NO;
NSInvocation *invocation = aspectModel.originalInvocation;
[invocation getArgument:&animated atIndex:2];
NSLog(@"hook所有对象的类方法");
}];
- hook同一个方法，优先级不同,优先级越高，越先执行
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
NSLog(@"准备执行viewWillAppear,执行的优先级是%d",aspectModel.priority);
}];
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"2" withPriority:1 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
NSLog(@"准备执行viewWillAppear,执行的优先级是%d",aspectModel.priority);
}];
- 移除hook
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
NSLog(@"准备执行viewWillAppear,执行的优先级是%d",aspectModel.priority);
}];
//移除hook后hook里面的block不执行
[self.vc removeHook:@selector(viewWillAppear:) withIdentify:@"1" withHookOption:(HookOptionPre)];
- 在hook的block中移除hook
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
NSLog(@"准备执行viewWillAppear,执行的优先级是%d",aspectModel.priority);
//移除hook后下一次执行方法的时候该hook里面的内容不执行
[self.vc removeHookInSFAspectBlock:@selector(viewWillAppear:) withIdentify:@"1" withHookOption:(HookOptionPre)];
}];
- hook中 pre,after，around的区别
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"1" withPriority:0 withHookOption:(HookOptionPre) withBlock:^(SFAspectModel *aspectModel, HookState state) {
//pre是在方法前执行
NSLog(@"pre-准备执行viewWillAppear");
}];
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"2" withPriority:0 withHookOption:(HookOptionAfter) withBlock:^(SFAspectModel *aspectModel, HookState state) {
//after是在方法前执行
NSLog(@"after-执行viewWillAppear后");
}];
[self.vc hookSel:@selector(viewWillAppear:) withIdentify:@"3" withPriority:0 withHookOption:(HookOptionAround) withBlock:^(SFAspectModel *aspectModel, HookState state) {
//around是在方法前后执行
if(state == HookStatePre){
NSLog(@"around准备执行viewWillAppear");
}
if (state == HookStateAfter) {
NSLog(@"around-准备执行viewWillAppear");
}
}];
Author
samstring, [email protected]
License
SFAspect is available under the MIT license. See the LICENSE file for more info.