使用手势UIGestureRecognizer对图像进行缩放、移动、旋转 *** 作

概述使用手势UIGestureRecognizer对图像进行缩放、移动、旋转 *** 作

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iOS提供了拍击、旋转、滑动、挤捏等丰富的手势，因此对图像的 *** 作就显得非常友好、简单。下面代码展示了使用UIGestureRecognizer对图像进行缩放 、移动、旋转 *** 作使用方法。在使用代码之前，首先建立一个UIVIEw，并在该视图中增加一个UIImageVIEw视图，用于展示图像。那么该UIVIEw就类似图 像画板一样，对图像的 *** 作都基于此视图中进行。

- (voID)vIEwDIDLoad {    [super vIEwDIDLoad];    UIPinchGestureRecognizer *pinchRecognizer = [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)] autorelease];    [pinchRecognizer setDelegate:self];    [self.vIEw addGestureRecognizer:pinchRecognizer];    UIRotationGestureRecognizer *rotationRecognizer = [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)] autorelease];    [rotationRecognizer setDelegate:self];    [self.vIEw addGestureRecognizer:rotationRecognizer];    UIPanGestureRecognizer *panRecognizer = [[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)] autorelease];    [panRecognizer setMinimumNumberOftouches:1];    [panRecognizer setMaximumNumberOftouches:1];    [panRecognizer setDelegate:self];    [canvas addGestureRecognizer:panRecognizer];    UITapGestureRecognizer *tapProfileImageRecognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)] autorelease];    [tapProfileImageRecognizer setNumberOfTapsrequired:1];    [tapProfileImageRecognizer setDelegate:self];    [canvas addGestureRecognizer:tapProfileImageRecognizer];}

// 缩放-(voID)scale:(ID)sender {    if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {      _lastScale = 1.0;    }    CGfloat scale = 1.0 - (_lastScale - [(UIPinchGestureRecognizer*)sender scale]);    CGAffinetransform currenttransform = photoImage.transform;    CGAffinetransform newtransform = CGAffinetransformScale(currenttransform,scale,scale);    [photoImage settransform:newtransform];    _lastScale = [(UIPinchGestureRecognizer*)sender scale];    [self showOverlayWithFrame:photoImage.frame];}// 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 = photoImage.transform;    CGAffinetransform newtransform = CGAffinetransformRotate(currenttransform,rotation);    [photoImage settransform:newtransform];    _lastRotation = [(UIRotationGestureRecognizer*)sender rotation];    [self showOverlayWithFrame:photoImage.frame];}// 移动-(voID)move:(ID)sender {  CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInVIEw:canvas];  if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {    _firstX = [photoImage center].x;    _firstY = [photoImage center].y;  }  translatedPoint = CGPointMake(_firstX+translatedPoint.x,_firstY+translatedPoint.y);  [photoImage setCenter:translatedPoint];  [self showOverlayWithFrame:photoImage.frame];}

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