Question

我需要，如果他触摸开始图像大小应该增加，如果他移动也相同，但如果在touchesended它需要成为原始大小如何做到这一点。任何人共享代码来做到这一点..提前谢谢..

Answer 1

让我们猜测您的图像是作为UIImageView实现的，如果是这样，您可以使用简单的转换。

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

比例（1.0 - 原始大小）

Answer 2

我猜你是UIImageView的子类 - 如果你没有，你应该现在就做。另外，请确保将图像的.userInteractionEnabled设置为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

如果当然，你可以将self.transform = sth变成动画，使它看起来更好。 ;）

Answer 3

您可以在touchesBegan方法中增加imageview的帧大小并缩放其中显示的图像（通过使用scaleimage来拟合）。 U可以在touchesEnded方法中将帧设置为原始大小。通过这种方式你可以实现你想要的动画效果。希望这会有所帮助。

Answer 4

将此代码放在touchesBegan

中

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

将此代码放入touchesEnded

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

如何在objective-c中为图像设置动画？

4 个答案: