target:action使用

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创建一个TargetActionView类

@interface TargetActionView : UIView@property(nonatomic,assign)id target;  //定义属性@property(nonatomic,assign) SEL action;-(id)initWithFrame:(CGRect)frame target:(id)target action:(SEL)action;//初始化方法@end实现#import "TargetActionView.h"@implementation TargetActionView- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}-(id)initWithFrame:(CGRect)frame target:(id)target action:(SEL)action{    self=[super initWithFrame:frame];    if (self) {        _target=target;        _action=action;    }    return self;}//touchesBegan方法-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [_target performSelector:_action withObject:self];}主函数 TargetActionView *targetActionView=[[TargetActionView alloc]initWithFrame:CGRectMake(30, 30, 130, 130) target:self action:@selector(changColor:)];    targetActionView.backgroundColor=[UIColor redColor];    [self.view addSubview:targetActionView];    // Do any additional setup after loading the view.}-(void)changColor:(TargetActionView *)color{    color.backgroundColor=[UIColor orangeColor];}

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