UIScrollView水平滚动 - 禁用左侧滚动

Question

如何禁用UIScrollview上的左侧滚动。这是因为用户只能向右滚动？

感谢

** * UPDATE * ****

这是我现在有。我有子类的UIScrollView并重写下列方法

@implementation TouchScrollView 

- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view { 
    NSLog(@"touchesShouldBegin: I was touched!"); 
    return YES; 
} 

- (BOOL)touchesShouldCancelInContentView:(UIView *)view { 
    NSLog(@"touchesShouldCancelInContentView: I was touched!"); 
    return NO; 
} 

在我的viewController我还设置以下属性：

scrollView.delaysContentTouches = NO; 
scrollView.canCancelContentTouches = YES; 

TouchesShouldBegin被调用，但touchesShouldCancelInContentView不会被调用，我不能找出原因！

谢谢

Answer 1

您应该处理滑动手势。

检查类似的问题在这里：iOS Advanced Gestures: Getting Swipe Direction Vector

Answer 2

只添加这在UIViewController UIScrollViewDelegate

float oldX; // here or better in .h interface 

- (void)scrollViewDidScroll:(UIScrollView *)aScrollView 
{ 
    if (scrollView.contentOffset.x < oldX) { 
     [aScrollView setContentOffset: CGPointMake(oldX, aScrollView.contentOffset.y)]; 
    } else { 
     oldX = aScrollView.contentOffset.x; 
    } 

}