给图片添加缩放、旋转、放大手势

最新推荐文章于 2021-11-10 09:16:31 发布

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最新推荐文章于 2021-11-10 09:16:31 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/hexuejie/p/7490663.html

本文介绍如何通过继承UIImageView并添加多种手势识别器实现图片视图的手势操作功能，包括捏合缩放、平移及旋转等。

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创建一个继承于uiimageview的子试图在头文件中添加手势

@interface LXQuaereEditImageView : LXBaseImageView <UIGestureRecognizerDelegate>

@property (nonatomic,strong,readonly) UIPinchGestureRecognizer *pinchGestureRecognizer;

@property (nonatomic,strong,readonly) UIPanGestureRecognizer *panGestureRecognizer;

@property (nonatomic,strong,readonly) UIRotationGestureRecognizer *rotationGestureRecognizer;

@end

在初始化的地方初始化手势

_tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureDetected:)];

[_tapGestureRecognizer setDelegate:self];

_pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGestureDetected:)];

[_pinchGestureRecognizer setDelegate:self];

_panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureDetected:)];

[_panGestureRecognizer setDelegate:self];

_rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGestureDetected:)];

[_rotationGestureRecognizer setDelegate:self];

[self addGestureRecognizer:_pinchGestureRecognizer];

[self addGestureRecognizer:_panGestureRecognizer];

[self addGestureRecognizer:_rotationGestureRecognizer];

设置该试图的交互性

[self setUserInteractionEnabled:YES];

设置代理

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer

{

return YES;

}

手势触发事件

- (void)pinchGestureDetected:(UIPinchGestureRecognizer *)recognizer

{

UIGestureRecognizerState state = [recognizer state];

if (state == UIGestureRecognizerStateBegan || state == UIGestureRecognizerStateChanged)

{

CGFloat scale = [recognizer scale];

[recognizer.view setTransform:CGAffineTransformScale(recognizer.view.transform, scale, scale)];

[recognizer setScale:1.0];

}

if ([self.delegate respondsToSelector:@selector(editImageViewPinchGesture:)]){

[self.delegate editImageViewPinchGesture:self];

}

- (void)panGestureDetected:(UIPanGestureRecognizer *)recognizer

{

UIGestureRecognizerState state = [recognizer state];

if (state == UIGestureRecognizerStateBegan || state == UIGestureRecognizerStateChanged)

{

CGPoint translation = [recognizer translationInView:recognizer.view];

[recognizer.view setTransform:CGAffineTransformTranslate(recognizer.view.transform, translation.x, translation.y)];

[recognizer setTranslation:CGPointZero inView:recognizer.view];

}

if ([self.delegate respondsToSelector:@selector(editImageViewPanGesture:)]){

[self.delegate editImageViewPanGesture:self];

}

- (void)rotationGestureDetected:(UIRotationGestureRecognizer *)recognizer

{

UIGestureRecognizerState state = [recognizer state];

if (state == UIGestureRecognizerStateBegan || state == UIGestureRecognizerStateChanged)

{

CGFloat rotation = [recognizer rotation];

[recognizer.view setTransform:CGAffineTransformRotate(recognizer.view.transform, rotation)];

[recognizer setRotation:0];

}

if ([self.delegate respondsToSelector:@selector(editImageViewRotationGesture:)]){

[self.delegate editImageViewRotationGesture:self];

}

转载于:https://www.cnblogs.com/hexuejie/p/7490663.html