涂鸦板
pod "DrawLine"
#import "MFSDDrawLineView.h"
MFSDDrawLineView* _MFSDDrawLineView = [[MFSDDrawLineView alloc]initWithFrame:self.view.bounds];
_MFSDDrawLineView.backgroundColor = [UIColor colorWithRed:0.192 green:0.985 blue:1.000 alpha:1.000];
_MFSDDrawLineView.currentLineColor = [UIColor redColor];
_MFSDDrawLineView.currentLineWidth = 5.0f;
[self.view addSubview:_MFSDDrawLineView];