咱们知道UITableView没有像UIButton那样能够经过addTarget方法来监听touch事件,所以在某些场合,特别是在UITableViewCell中包含UITextField的时候,咱们颇有可能想经过点击UITableView的其余地方来取消UITextField的焦点。也许有朋友会说,使用UITapGestureRecognizer手势来取消焦点,这样是能够行得通,可是若是TextField中有clearButton或者其自定义的Button的时候,手势就会吸取掉事件了,致使按钮无效。atom
所以,我想到的作法就是重写UITableView的touch相关的方法,而后经过委托的方式提供给外部对象使用。首先定义Delegate:code
@protocol TouchTableViewDelegate <NSObject> @optional - (void)tableView:(UITableView *)tableView touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; - (void)tableView:(UITableView *)tableView touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event; - (void)tableView:(UITableView *)tableView touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event; - (void)tableView:(UITableView *)tableView touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; @end
而后UITableView的子类加入一委托对象,并重写全部touch相关方法,以下:orm
@interface TouchTableView : UITableView { @private id _touchDelegate; } @property (nonatomic,assign) id<TouchTableViewDelegate> touchDelegate; @end
@implementation TouchTableView @synthesize touchDelegate = _touchDelegate; - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; if ([_touchDelegate conformsToProtocol:@protocol(TouchTableViewDelegate)] && [_touchDelegate respondsToSelector:@selector(tableView:touchesBegan:withEvent:)]) { [_touchDelegate tableView:self touchesBegan:touches withEvent:event]; } } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesCancelled:touches withEvent:event]; if ([_touchDelegate conformsToProtocol:@protocol(TouchTableViewDelegate)] && [_touchDelegate respondsToSelector:@selector(tableView:touchesCancelled:withEvent:)]) { [_touchDelegate tableView:self touchesCancelled:touches withEvent:event]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesEnded:touches withEvent:event]; if ([_touchDelegate conformsToProtocol:@protocol(TouchTableViewDelegate)] && [_touchDelegate respondsToSelector:@selector(tableView:touchesEnded:withEvent:)]) { [_touchDelegate tableView:self touchesEnded:touches withEvent:event]; } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesMoved:touches withEvent:event]; if ([_touchDelegate conformsToProtocol:@protocol(TTWTableViewDelegate)] && [_touchDelegate respondsToSelector:@selector(tableView:touchesMoved:withEvent:)]) { [_touchDelegate tableView:self touchesMoved:touches withEvent:event]; } } @end
重写touch方法时必须把父类实现方法写上,不然UITableViewCell将没法正常工做。全部的改写工做如上所示,新的TableView类具备touch事件响应了,使用方法也很简单在原有UITableView的基础上赋予touchDelegate委托便可取到touch事件响应。以下:对象
- (void)loadView { [super loadView]; TouchTableView *tableView = [[TouchTableView alloc]initWithFrame:CGRectMake(0.0, 0.0, 320, 460) style:UITableViewStyleGrouped]; tableView.touchDelegate = self; //相关处理 [self.view addSubview:tableView]; [tableView release]; } - (void)tableView:(TTWTableView *)tableView touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { //touch结束后的处理 }