Xcode如何在多次触摸后删除图像？
问题描述：
我使用此代码触摸'云'的事件动画。所有工作正常，但我想在用户点击三次云后淡入淡出/删除云。所以我希望它们在第三次触摸后消失。我该怎么做呢？Xcode如何在多次触摸后删除图像？
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
CGRect cloudBLRect = [[[self.cloudBL layer] presentationLayer] frame];
if (CGRectContainsPoint(cloudBLRect, touchLocation)) {
NSLog(@"cloudBL tapped!");
cloudBLPressed = true;
[UIView animateWithDuration:1.0
delay:0.0
options:UIViewAnimationOptionCurveEaseInOut
animations:^{
self.cloudBL.center = CGPointMake(200, 600);
self.cloudBL.alpha = 0.5;
}
completion:^(BOOL finished) {
[UIView animateWithDuration:2.0
delay:2.0
options: UIViewAnimationOptionCurveEaseInOut
animations:^{
self.cloudBL.center = CGPointMake(100, 700);
self.cloudBL.alpha = 0.5;
} completion:^(BOOL finished) {
self.cloudBL.alpha = 1.0;
}];
} else {
NSLog(@"cloud not tapped.");
return;
}
if (cloudBLPressed) return;
}
答
以一个可变count并将其初始化为0。每个触摸，通过1.增加它在touchGesture方法还要检查，如果count变量等于2则设定为alpha云0.0。
事情是这样的：在 .m文件需要私人诠释vairiable：int count; in viewDidLoad: count = 0; cloudView.alpha = 1.0;
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
count++;
if(count<2)
{
cloudView.alpha-=0.33;
}
else {
cloudView.alpha = 0.0;
}
}
它添加在动画中的逻辑。希望有所帮助。
您可以设置它在你的代码是这样的：
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
CGRect cloudBLRect = [[[self.cloudBL layer] presentationLayer] frame];
if(count < 2)
{
count++;
if (CGRectContainsPoint(cloudBLRect, touchLocation)) {
NSLog(@"cloudBL tapped!");
cloudBLPressed = true;
[UIView animateWithDuration:1.0
delay:0.0
options:UIViewAnimationOptionCurveEaseInOut
animations:^{
self.cloudBL.center = CGPointMake(200, 200);
// self.cloudBL.alpha -=0.33;
}
completion:^(BOOL finished) {
[UIView animateWithDuration:2.0
delay:2.0
options: UIViewAnimationOptionCurveEaseInOut
animations:^{
self.cloudBL.center = CGPointMake(100, 300);
self.cloudBL.alpha -=0.33;
} completion:^(BOOL finished) {
// self.cloudBL.alpha = 1.0;
}];
}];
}
else {
NSLog(@"cloud not tapped.");
return;
}
if (cloudBLPressed) return;
} else {
[UIView animateWithDuration:2.0
delay:2.0
options: UIViewAnimationOptionCurveEaseInOut
animations:^{
self.cloudBL.center = CGPointMake(100, 300);
self.cloudBL.alpha =0.0;
} completion:^(BOOL finished) {
}];
}
}
答
你可以这样做：
UITapGestureRecognizer * tripleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourAction:)];
tripleTap.numberOfTapsRequired = 3;
[yourView addGestureRecognizer:tripleTap];
答
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOnImage:)];
[cloud addGestureRecognizer:tapRecognizer];
}
- (void)tapOnImage:(UITapGestureRecognizer *)gesture
{
tapsCounter++;
if (tapsCounter == 3)
{
// do your stuff
tapsCounter = 0;
}
}
我建议你这个逻辑进入UIImageView子类，代表云对象。
答
适当的委托UIGestureRecognizerDelegate添加到您的接口。
然后在您的viewDidLoad：
UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapMethod)];
tapped.delegate=self;
tapped.numberOfTapsRequired = 3;
[self.view addGestureRecognizer:tapped];
，然后在您的视图控制器：
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if (touch.view != cloudView&& cloudView)
{
return YES;
}
return NO;
}
-(void)tapMethod
{
[cloudView removeFromSuperview];
cloudView = nil;
}
这需要用户轻按三图像（快） – damirstuhec
不是设置单击手势和“UITapGestureRecognier”子类上的迭代器可能是一个解决方案。 – BriceB
在游戏中，水龙头可能不会按正常顺序发生。玩家可能会按照1-2-1-3-2-3-3-2-1的顺序触摸3个云。你的解决方案只适用于1-1-1-2-2-2-3-3-3的情况，这是一种极不可能的情况，事件总是以不规则的方式发生。 – holex