objective-c - "Drag ' n ' Drop"游戏动画

Question

我对 Objective-C 很陌生，希望创建一个相当简单的 Jigsaw。我目前正在考虑制作一个四片拼图作为学习该方法的一种方式。

目前，我在屏幕周围放置了 4 个片段，当将其拖动到屏幕上的特定位置时，会捕捉到该位置。

我的问题是尝试为触摸设置动画。我希望触摸的图像能扩大一点，但我在语法上遇到了问题。我查看了 Apple 提供的 MoveMe 示例，但在这种情况下它对我没有帮助。下面是代码。我将不胜感激任何帮助。谢谢。

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    //location of current touch
    CGPoint location = [touch locationInView:self.view];
    if ([touch view] == image1) {
        image1.center = location;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.5];
        image1.transform = CGAffineTransformMakeScale(1.5, 1.5);  
        [UIView commitAnimations];    
    } else if ([touch view] == image2) {
        image2.center = location;
        animateFirstTouch:image2;
    } else if ([touch view] == image3) {
        image3.center = location;
        image3.transform = CGAffineTransformMakeScale(1.5, 1.5);
    } else if ([touch view] == image4) {
        image4.center = location;
        image4.transform = CGAffineTransformMakeScale(1.5, 1.5);
    }

}

-(void) animateFirstTouch:(UIView *)image {
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.5];
    self.view.transform = CGAffineTransformMakeScale(1.5, 1.5);  
    [UIView commitAnimations];  
}

image1 的代码有效，图像在 0.5 秒内放大。

image2 的代码抛出错误:表达式结果未用于 animateFirstTouch:image2。

image3 和 image4 的代码在没有动画的情况下放大图像。

Answer 1

请参阅此链接中 Kuldeep 的回答。我认为这对你有用:

iPhone/iOS: How to implement Drag and Drop for subviews of a Scrollview?

另一种选择是引用iPhone在此链接中的答案:

iPhone App: implementation of Drag and drop images in UIView

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    //location of current touch
    CGPoint location = [touch locationInView:self.view];
    if ([touch view] == image1) {
       [self animateFirstTouch:image1 withLocation:location];
    } else if ([touch view] == image2) {
       [self animateFirstTouch:image2 withLocation:location];
    } else if ([touch view] == image3) {
       [self animateFirstTouch:image3 withLocation:location];
    } else if ([touch view] == image4) {
        [self animateFirstTouch:image4 withLocation:location];
    }

}

-(void) animateFirstTouch:(UIImageView *)image withLocation:(CGPoint)location {
        image.center = location;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:0.5];
        image.transform = CGAffineTransformMakeScale(1.5, 1.5);  
        [UIView commitAnimations];   
}

希望这对您有帮助。

如果您需要更多帮助，请联系我。