iOS 给自定义视图添加高亮背景色
UITableView的默认Cell，是有点击选中的高亮背景色的，UIButton也可以通过设置不同状态的背景图片来实现高亮，那么如何给自定义视图添加高亮呢？ 一个技术上可行的方法就是重写UIView的各种touches方法，自己记录点击选中，点击取消等状态，不过很繁琐。 还有一个是重写UIControl的下面四个方法，下面四个方法将点击选中，取消等状态处理简化了 //是否可以开始追踪事件 - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(nullable UIEvent *)event; //是否持续追踪事件 - (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(nullable UIEvent *)event; //事件追踪结束 - (void)endTrackingWithTouch:(nullable UITouch *)touch withEvent:(nullable UIEvent *)event; // touch is sometimes nil if cancelTracking calls through to this. //事件追踪取消 - (void)cancelTrackingWithEvent:(nullable UIEvent *)event; // event may be nil if cancelled for non-event reasons, e.g. 具体示例 - (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(nullable UIEvent *)event { BOOL b = [super beginTrackingWithTouch:touch withEvent:event]; if (b) { 如果开始追踪，那么就高亮显示 [super setBackgroundColor:高亮色]; } return b; } - (void)endTrackingWithTouch:(nullable UITouch *)touch withEvent:(nullable UIEvent *)event { [super endTrackingWithTouch:touch withEvent:event]; //结束追踪 恢复原始背景色 [super setBackgroundColor:原始背景色]; } - (void)cancelTrackingWithEvent:(nullable UIEvent *)event { [super cancelTrackingWithEvent:event]; //取消追踪 恢复原始背景色 [super setBackgroundColor:原始背景色]; }