iphone - 多点触控在我正在构建的 iphone 应用程序中不起作用

Question

我有以下代码:

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {


NSUInteger touchCount = 0;
// Enumerates through all touch objects
for (UITouch *touchb in touches){
    touchCount++;
}


// When multiple touches, report the number of touches. 
if (touchCount > 1) {
    lblStatustouch.text = [NSString stringWithFormat:@"Tracking %d touches", touchCount];
} else {
    lblStatustouch.text = [NSString stringWithFormat:@"Tracking 1 touch", touchCount];
}

当我运行它时，它从未检测到超过一次触摸。是否有某些设置可能会阻止我的应用进行多次触摸？或者我在这里遗漏了什么？

Answer 1

您需要在 InterfaceBuilder 中的 View 上启用“多点触控”

alt text http://img.skitch.com/20090227-rpkafsxtg56pujk1h1583if88i.jpg

或者如果您已经在代码中创建了 View ，它是用

[theView setMultipleTouchEnabled:YES];