如何在objective-c中動畫圖像？

Question

我需要他的圖像尺寸touchBegan應該增加，如果他的移動也相同，但如果 在touchesended它需要成爲原始大小如何做到這一點。可以任何一個共享代碼要做到這一點..thanks在預先..

Answer 1

可以在方法的touchesBegan增加的ImageView的幀尺寸和比例在它顯示的圖像（通過使用scaleimage以適應）。 U可以在touchesEnded方法中將框架設置爲原始尺寸。通過這種方式，你可以達到你想要的動畫效果。希望這會有所幫助。

Answer 2

讓我們猜測，你的形象被實現爲UIImageView的，如果是的話，你可以使用簡單的轉換。

yourImage.transform = CGAffineTransformMakeScale（scale.x，scale.y）;

規模（1.0 - 原始大小）

Answer 3

將此代碼放在您的touchesBegan

[UIView animateWithDuration:0.3 animations:^{ 
    myImage.transform = CGAffineTransformMakeScale(1.5, 1.5); 
}]; 

將此代碼放在您的touchesEnded

[UIView animateWithDuration:0.3 animations:^{ 
    myImage.transform = CGAffineTransformMakeScale(1.0, 1.0); 
}]; 

Answer 4

我猜你的子類的UIImageView - 如果你沒有不，你應該現在就做。 另外，請確保將圖像的.userInteractionEnabled設置爲YES！

接口：

@interface YourImageView : UIImageView 
@property (nonatomic, assign) CGPoint originalCenter; 
@property (nonatomic, assign) CGPoint touchLocation; 
@end 

Implamentation：

@implementation YourImageView 
@synthesize originalCenter; 
@synthesize touchLocation; 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [super touchesBegan:touches withEvent:event]; 

    self.originalCenter = self.center; 
    self.touchLocation = [[touches anyObject] locationInView:self.superview]; 
    self.transform = CGAffineTransformMakeScale(1.5, 1.5); 
} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [super touchesMoved:touches withEvent:event]; 

    CGPoint touch = [[touches anyObject] locationInView:self.superview]; 
    CGFloat xDifference = (touch.x - self.touchLocation.x); 
    CGFloat yDifference = (touch.y - self.touchLocation.y); 

    CGPoint newCenter = self.originalCenter; 
    newCenter.x += xDifference; 
    newCenter.y += yDifference; 
    self.center = newCenter; 
} 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [super touchesEnded:touches withEvent:event]; 

    self.originalCenter = CGPointZero; 
    self.touchLocation = CGPointZero; 
    self.transform = CGAffineTransformMakeScale(1.0, 1.0); 
} 

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [super touchesCancelled:touches withEvent:event]; 

    self.originalCenter = CGPointZero; 
    self.touchLocation = CGPointZero; 
    self.transform = CGAffineTransformMakeScale(1.0, 1.0); 
} 
@end 

你可以，如果當然，翹曲self.transform =某物成動畫，使它看起來更好。 ;）