与另一个动态的UIImage

Question

我一直坚持的东西天那一定是很简单的面膜UIImage的，我已经搜查了几天，但我似乎无法得到正确的代码工作。

我有两个图像，一个背景图像和另一个图像，将掩盖第一个。我可以用手势移动蒙面图像。我可以缩放它，旋转它并移动它。

http://i45.tinypic.com/dyq2k8.png

当我按下测试按钮我想她的脸上得到裁剪/屏蔽到从模板图像的当前位置的另一UIImage的。

上我应该做的事情有什么想法？

帮助将是非常，非常好的:) 感谢。

Answer 1

：P

有趣的是。我已经写了一个演示应用程序，它会做你想做的一切，捏放大，平移照片。

您必须提供自己的形象，我只复制源，但在这里它是：

// ------------------------------------------------ 
// view controller header file 
// ------------------------------------------------ 
#import <UIKit/UIKit.h> 

@interface ViewController : UIViewController <UIGestureRecognizerDelegate> 
{ 
    UIButton *btnEdit; 
    BOOL isEditing; 
    UIImageView *displayImage; 
    UIImageView *photoView; 
    UIImageView *maskView; 
} 

@end 





// ------------------------------------------------  
// view controller implementation file 
// ------------------------------------------------ 

#import "ViewController.h" 
#import <QuartzCore/QuartzCore.h> 

@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 

    isEditing = false; 

    photoView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; 
    [photoView setImage:[UIImage imageNamed:@"photo.png"]]; 
    photoView.hidden = YES; 

    maskView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; 
    [maskView setImage:[UIImage imageNamed:@"maskguide.png"]]; 
    maskView.hidden = YES; 

    displayImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; 

    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]; 
    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)]; 

    [panGesture setDelegate:self]; 
    [pinchGesture setDelegate:self]; 

    [photoView addGestureRecognizer:panGesture]; 
    [photoView addGestureRecognizer:pinchGesture]; 
    [photoView setUserInteractionEnabled:YES]; 

    [panGesture release]; 
    [pinchGesture release]; 

    btnEdit = [[UIButton alloc] initWithFrame:CGRectMake(60, 400, 200, 50)]; 
    [btnEdit setBackgroundColor:[UIColor blackColor]]; 
    [btnEdit setTitle:@"Start Editing" forState:UIControlStateNormal]; 
    [btnEdit addTarget:self action:@selector(toggleEditing) forControlEvents:UIControlEventTouchUpInside]; 

    [[self view] addSubview:displayImage]; 
    [[self view] addSubview:photoView]; 
    [[self view] addSubview:maskView]; 
    [[self view] addSubview:btnEdit]; 

    [self updateMaskedImage]; 
} 

- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
} 

-(void)dealloc 
{ 
    [btnEdit release]; 

    [super dealloc]; 
} 

#pragma mark - 
#pragma mark Update Masked Image Method 
#pragma mark - 

-(void)updateMaskedImage 
{ 
    maskView.hidden = YES; 

    UIImage *finalImage = 
    [self maskImage:[self captureView:self.view] 
      withMask:[UIImage imageNamed:@"mask.png"]]; 


    maskView.hidden = NO; 

    //UIImage *finalImage = [self maskImage:photoView.image withMask:[UIImage imageNamed:@"mask.png"]]; 

    [displayImage setImage:finalImage]; 
} 

- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage { 

    CGImageRef maskRef = maskImage.CGImage; 

    CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), 
             CGImageGetHeight(maskRef), 
             CGImageGetBitsPerComponent(maskRef), 
             CGImageGetBitsPerPixel(maskRef), 
             CGImageGetBytesPerRow(maskRef), 
             CGImageGetDataProvider(maskRef), NULL, false); 

    CGImageRef masked = CGImageCreateWithMask([image CGImage], mask); 
    return [UIImage imageWithCGImage:masked]; 

} 

#pragma mark - 
#pragma mark Touches Began 
#pragma mark - 

// adjusts the editing flag to make dragging and drop work 
-(void)toggleEditing 
{ 
    if(!isEditing) 
    { 
     isEditing = true; 

     NSLog(@"editing..."); 

     [btnEdit setTitle:@"Stop Editing" forState:UIControlStateNormal]; 

     displayImage.hidden = YES; 
     photoView.hidden = NO; 
     maskView.hidden = NO; 
    } 
    else 
    { 
     isEditing = false; 

     [self updateMaskedImage]; 

     NSLog(@"stopped editting"); 

     [btnEdit setTitle:@"Start Editing" forState:UIControlStateNormal]; 

     displayImage.hidden = NO; 
     photoView.hidden = YES; 
     maskView.hidden = YES; 
    } 
} 

/* 
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    if(isEditing) 
    { 
     UITouch *finger = [touches anyObject]; 
     CGPoint currentPosition = [finger locationInView:self.view]; 

     //[maskView setCenter:currentPosition]; 
     //[photoView setCenter:currentPosition]; 
     if([touches count] == 1) 
     { 
      [photoView setCenter:currentPosition]; 
     } 
     else if([touches count] == 2) 
     { 

     } 
    } 
} 
*/ 

-(void)handlePan:(UIPanGestureRecognizer *)recognizer 
{  
    CGPoint translation = [recognizer translationInView:self.view]; 
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, 
             recognizer.view.center.y + translation.y); 
    [recognizer setTranslation:CGPointMake(0, 0) inView:self.view]; 
} 

-(void)handlePinch:(UIPinchGestureRecognizer *)recognizer 
{  
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale); 
    recognizer.scale = 1; 
} 

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 
{ 
    return YES; 
} 

#pragma mark - 
#pragma mark Capture Screen Function 
#pragma mark - 

- (UIImage*)captureView:(UIView *)yourView 
{ 
    UIGraphicsBeginImageContextWithOptions(yourView.bounds.size, yourView.opaque, 0.0); 
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    [yourView.layer renderInContext:context]; 
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return image; 
} 

#pragma mark - 

@end