我试图让touchesBegan回应多点触控时遇到一些问题。
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSSet *allTouches = [event allTouches];
for (UITouch *touch in allTouches)
{
CGPoint location = [touch locationInView:touch.view];
if(CGRectContainsPoint(snare.frame, location) && lastButton != snare) {
//Swap Image
snareImg.image = snareImgDown;
[self performSelector:@selector(swapBack) withObject:nil afterDelay:0.1];
//Play Sound
NSString *path = [[NSBundle mainBundle] pathForResource:@"snare"
ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path]
, &soundID);
AudioServicesPlaySystemSound (soundID);
//
lastButton = snare;
}
else if(CGRectContainsPoint(hiHat.frame, location) && lastButton != hiHat) {
//Play Sound
NSString *path = [[NSBundle mainBundle] pathForResource:@"hi_hat"
ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path]
, &soundID);
AudioServicesPlaySystemSound (soundID);
//
lastButton = hiHat;
}
我不知道如何设置它以便它会响应多点触控,现在touchesBegan只适用于1按。我知道有些东西就像我在假装一样(UITOuch * t in something)我无法记住它是如何工作的。
谁知道怎么做?
除非您设置multipleTouchEnabled = YES
,否则默认情况下只会进行一次触摸。那么你的代码应该按预期工作。