由于scrollView 不会执行touch方法，所以给父控件self.view 加上一个 点击手势 在点击方法里加一个 [self.view endEditing] 也可以取消键盘
界面消失的时候调用点击手势：[self tapGesture:_tapGesture];
-(void)addGesture
{
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGesture:)];
//点击所需的手指
tapGesture.numberOfTouchesRequired = 1;
//点击次数
tapGesture.numberOfTapsRequired = 1;
[self.view addGestureRecognizer:tapGesture];
self.tapGesture=tapGesture;
}
-(void)tapGesture:(UITapGestureRecognizer*)gesture
{
[self.view endEditing:YES];
}
