实现下面几个状态的点击事件

1.UIControlEventTouchUpInside

2.UIControlEventTouchUpOutside

3.UIControlEventTouchDown

@implementation MyViewController- (void)viewDidLoad {    [super viewDidLoad];    [self.view addSubview:self.saveBtn];}-(UIButton *)saveBtn{    if (!_saveBtn) {        _saveBtn = [UIButton buttonWithType:UIButtonTypeCustom];        _saveBtn.frame = CGRectMake(0, 0, self.view.frame.size.width);        _saveBtn.backgroundColor = [UIColor colorFromHexValue:0xFF2741];        _saveBtn.titleLabel.textAlignment = NSTextAlignmentCenter;        _saveBtn.titleLabel.font = [UIFont systemFontOfSize:16];        [_saveBtn setTitle:[NSString stringWithFormat:@"保存"] forState:UIControlStateNormal];        [_saveBtn addTarget:self action:@selector(touchDown) forControlEvents:UIControlEventTouchDown];        [_saveBtn addTarget:self action:@selector(touchUpOutside) forControlEvents:UIControlEventTouchUpOutside];        [_saveBtn addTarget:self action:@selector(saveClick) forControlEvents:UIControlEventTouchUpInside];    }    return _saveBtn;}//按下的效果-(void)touchDown{    self.saveBtn.backgroundColor = [UIColor colorFromHexValue:0x9B0000];}//按下拖出按钮松手还原-(void)touchUpOutside{    self.saveBtn.backgroundColor = [UIColor colorFromHexValue:0xFF2741];}//点击方法-(void)saveClick{    self.saveBtn.backgroundColor = [UIColor colorFromHexValue:0xFF2741];    NSLog(@"save");}@end复制代码