橢圓形的作物圖像

Question

我正在開發應用程序，在這個應用程序中我需要給出一個裁剪選項。一旦我從照相機或圖庫中選擇圖像，它應該在編輯頁面上打開，我們有橢圓形圖像，並帶有縮放&移動選項。一旦我們點擊應用，拍攝的圖像應該裁剪成橢圓形。

現在下面的屏幕是從鳥舍sdk。但它有方形種植需要在橢圓形的種植&。我試圖定製它，但無法做到這一點。

任何人都可以給我建議最容易的實現這一目標的最佳合適的方式。

謝謝。

Answer 1

- (UIImage *)croppedPhoto { 
    // For dealing with Retina displays as well as non-Retina, we need to check 
    // the scale factor, if it is available. Note that we use the size of teh cropping Rect 
    // passed in, and not the size of the view we are taking a screenshot of. 
CGRect croppingRect = CGRectMake(imgMaskImage.frame.origin.x, 
imgMaskImage.frame.origin.y, imgMaskImage.frame.size.width, 
imgMaskImage.frame.size.height); 

    imgMaskImage.hidden=YES; 

    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) { 
    UIGraphicsBeginImageContextWithOptions(croppingRect.size, YES, [UIScreen mainScreen].scale); 
    } else { 
     UIGraphicsBeginImageContext(croppingRect.size); 
    } 

    // Create a graphics context and translate it the view we want to crop so 
    // that even in grabbing (0,0), that origin point now represents the actual 
    // cropping origin desired: 
    CGContextRef ctx = UIGraphicsGetCurrentContext(); 
    CGContextTranslateCTM(ctx, -croppingRect.origin.x, -croppingRect.origin.y); 
    [self.view.layer renderInContext:ctx]; 

    // Retrieve a UIImage from the current image context: 
    UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 

    // Return the image in a UIImageView: 
    return snapshotImage; 
} 

Answer 2

這種類型的屏蔽可以執行，否則你用椰子控制

的.h文件： -

@interface yourClass : UIImageView 

@end 

.m文件： -

#import <QuartzCore/QuartzCore.h> 

    @implementation yourClass 

    - (void)awakeFromNib 
    { 
     [super awakeFromNib]; 
     CALayer *mask = [CALayer layer]; 
     mask.contents = (id)[[UIImage imageNamed:@"ovalMask.png"] CGImage]; 
     CGSize size = self.frame.size; 
     mask.frame = CGRectMake(0, 0, size.width, size.height); 
     self.layer.mask = mask; 
     [self.layer setMasksToBounds:YES]; 
    } 

@end