旋转，移动，frame的混用，

最新推荐文章于 2025-08-05 19:15:32 发布

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本文介绍如何使用UIRotationGestureRecognizer和UIPanGestureRecognizer实现iOS应用中图像视图的旋转和平移功能。通过设置手势识别器的目标和动作，可以响应用户的触摸操作，并更新图像视图的显示状态。

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UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];

[rotationRecognizer setDelegate:self];

[self.view addGestureRecognizer:rotationRecognizer];

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];

[panRecognizer setMinimumNumberOfTouches:1];

[panRecognizer setMaximumNumberOfTouches:1];

[panRecognizer setDelegate:self];

[self.view addGestureRecognizer:panRecognizer];

// 旋转

-(void)rotate:(id)sender {

if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {

_lastRotation = 0.0;

return;

}

CGFloat rotation = 0.0 - (_lastRotation - [(UIRotationGestureRecognizer*)sender rotation]);

CGAffineTransform currentTransform = _imageView.transform;

CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);

[_imageView setTransform:newTransform];

_lastRotation = [(UIRotationGestureRecognizer*)sender rotation];

}

// 移动

-(void)move:(id)sender {

CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {

_startPoint = translatedPoint;

_firstX = [_imageView center].x;

_firstY = [_imageView center].y;

}

else if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateChanged)

{

_changePoint = translatedPoint;

_imageView.transform = CGAffineTransformTranslate(_imageView.transform, _changePoint.x - _startPoint.x, _changePoint.y - _startPoint.y);

_startPoint = _changePoint;

}

// 改变 frame 的 height

- (IBAction)declineHH:(id)sender

{

CGAffineTransform aaaaaTransform = _imageView.transform;

[_imageView setTransform:CGAffineTransformIdentity];

_imageView.frame = CGRectMake(_imageView.frame.origin.x, _imageView.frame.origin.y, _imageView.frame.size.width, _imageView.frame.size.height - 2);

[_imageView setTransform:aaaaaTransform];

}

// 改变frame width

- (IBAction)declineWW:(id)sender

{

CGAffineTransform aaaaaTransform = _imageView.transform;

[_imageView setTransform:CGAffineTransformIdentity];

_imageView.frame = CGRectMake(_imageView.frame.origin.x, _imageView.frame.origin.y, _imageView.frame.size.width - 2, _imageView.frame.size.height);

[_imageView setTransform:aaaaaTransform];

}