我有可旋转，摇动并用手势识别器缩放的的UIImageView。 因此，它在其封闭视图裁剪 。 一切工作正常，但我不知道如何保存在其全分辨率图像的可见部分 。 这不是一个屏幕抓取。
我知道我来自的UIImageView可见内容获得的UIImage直的，但它是有限的屏幕分辨率。
我认为我必须做对UIImage的相同变换和裁剪。 有一个简单的方法来做到这一点？
更新 ：比如，我有一个高分辨率图像的UIImageView的，比方说，一个800万像素的iPhone 4S的摄像头的照片，这是转化用手势，所以它成为缩放，旋转，并在其封闭视图搬来搬去。 显然，有一些裁剪回事所以只有图像的一部分被显示。 还有就是显示屏幕分辨率和强调图像分辨率之间的巨大差异，我需要在图像分辨率的图像。 该UIImageView的是UIViewContentModeScaleAspectFit，但UIViewContentModeScaleAspectFill的解决方案也未尝不可。
这是我的代码：
- (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer {
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
[gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
[gestureRecognizer setRotation:0];
}
}
- (void)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer {
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
[gestureRecognizer view].transform = CGAffineTransformScale([[gestureRecognizer view] transform], [gestureRecognizer scale], [gestureRecognizer scale]);
[gestureRecognizer setScale:1];
}
}
-(void)panGestureMoveAround:(UIPanGestureRecognizer *)gestureRecognizer;
{
UIView *piece = [gestureRecognizer view];
//We pass in the gesture to a method that will help us align our touches so that the pan and pinch will seems to originate between the fingers instead of other points or center point of the UIView
if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
CGPoint translation = [gestureRecognizer translationInView:[piece superview]];
[piece setCenter:CGPointMake([piece center].x + translation.x, [piece center].y+translation.y)];
[gestureRecognizer setTranslation:CGPointZero inView:[piece superview]];
} else if([gestureRecognizer state] == UIGestureRecognizerStateEnded) {
//Put the code that you may want to execute when the UIView became larger than certain value or just to reset them back to their original transform scale
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
// if the gesture recognizers are on different views, don't allow simultaneous recognition
if (gestureRecognizer.view != otherGestureRecognizer.view)
return NO;
// if either of the gesture recognizers is the long press, don't allow simultaneous recognition
if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] || [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])
return NO;
return YES;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
faceImageView.image = appDelegate.faceImage;
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotatePiece:)];
[faceImageView addGestureRecognizer:rotationGesture];
[rotationGesture setDelegate:self];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scalePiece:)];
[pinchGesture setDelegate:self];
[faceImageView addGestureRecognizer:pinchGesture];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureMoveAround:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:2];
[panRecognizer setDelegate:self];
[faceImageView addGestureRecognizer:panRecognizer];
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[appDelegate fadeObject:moveIcons StartAlpha:0 FinishAlpha:1 Duration:2];
currentTimer = [NSTimer timerWithTimeInterval:4.0f target:self selector:@selector(fadeoutMoveicons) userInfo:nil repeats:NO];
[[NSRunLoop mainRunLoop] addTimer: currentTimer forMode: NSDefaultRunLoopMode];
}
