如何在不規則形狀的框架中適合圖像

Question

我有關於不規則形狀的問題。我搜查了很多，但沒有什麼對我有用。我有許多不規則形狀的框架，每個框架又被分成多個子區域。我想在照片庫的每個子區域中放入圖片。但我無法獲得每個子區域的位置，並且因爲形狀也不規則，所以再次成爲另一個適合該區域圖像的問題。誰能幫我 ！！這是該框架的一個例子。

Answer 1

你永遠不會有不規則形狀的框架。框架將始終保持原狀。 您可以通過檢測透明區域來完成。

Refer this link. It will give you idea how to do that :)

Answer 2

你想通過圓弧裁剪的各種圖像？例如，這裏是一個具有四個圖像（只是隨機圖像我從搜索得到了狗上http://images.google.com）的屏幕快照：

這裏是由圓裁剪相同的四個圖像（或者更準確中，四個圖像分別由相同的圓路徑裁剪）：

下面是確實的代碼

- (UIImage *)cropImage:(UIImage *)image locatedAt:(CGRect)imageFrame byCircleAt:(CGPoint)center withRadius:(float)radius 
{ 
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
    CGContextRef context = CGBitmapContextCreate(NULL, imageFrame.size.width, imageFrame.size.height, 8, 4 * imageFrame.size.width, colorSpace, kCGImageAlphaPremultipliedFirst); 

    CGContextBeginPath(context); 
    CGRect ellipseFrame = CGRectMake(center.x - imageFrame.origin.x - radius, imageFrame.size.height - (center.y - imageFrame.origin.y - radius) - radius * 2.0, radius * 2.0, radius * 2.0); 
    CGContextAddEllipseInRect(context, ellipseFrame); 
    CGContextClosePath(context); 
    CGContextClip(context); 

    CGContextDrawImage(context, CGRectMake(0, 0, imageFrame.size.width, imageFrame.size.height), image.CGImage); 

    CGImageRef imageMasked = CGBitmapContextCreateImage(context); 
    CGContextRelease(context); 
    CGColorSpaceRelease(colorSpace); 

    UIImage *newImage = [UIImage imageWithCGImage:imageMasked]; 

    CGImageRelease(imageMasked); 

    return newImage; 
} 

- (void)addSingleCroppedImage:(UIImage *)image at:(CGRect)imageFrame byCircleAt:(CGPoint)center withRadius:(float)radius 
{ 
    UIImage *newImage = [self cropImage:image locatedAt:imageFrame byCircleAt:center withRadius:radius]; 
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:imageFrame]; 
    imageView.image = newImage; 
    [self.view addSubview:imageView]; 
} 

- (void)addCroppedImages 
{ 
    NSString *bundlePath = [[NSBundle mainBundle] resourcePath]; 

    CGPoint center = CGPointMake(self.view.frame.size.width/2.0, self.view.frame.size.width/2.0); 
    float radius = 150.0; 

    UIImage *dog1 = [UIImage imageWithContentsOfFile:[bundlePath stringByAppendingPathComponent:@"imgres-1.jpg"]]; 
    UIImage *dog2 = [UIImage imageWithContentsOfFile:[bundlePath stringByAppendingPathComponent:@"imgres-2.jpg"]]; 
    UIImage *dog3 = [UIImage imageWithContentsOfFile:[bundlePath stringByAppendingPathComponent:@"imgres-3.jpg"]]; 
    UIImage *dog4 = [UIImage imageWithContentsOfFile:[bundlePath stringByAppendingPathComponent:@"imgres-4.jpg"]]; 

    CGRect frame; 
    UIImage *currentImage; 

    // upper left 

    currentImage = dog1; 
    frame = CGRectMake(center.x - currentImage.size.width, center.y - currentImage.size.height, currentImage.size.width, currentImage.size.height); 
    [self addSingleCroppedImage:currentImage at:frame byCircleAt:center withRadius:radius]; 

    // upper right 

    currentImage = dog2; 
    frame = CGRectMake(center.x, center.y - currentImage.size.height, currentImage.size.width, currentImage.size.height); 
    [self addSingleCroppedImage:currentImage at:frame byCircleAt:center withRadius:radius]; 

    // lower left 

    currentImage = dog3; 
    frame = CGRectMake(center.x - currentImage.size.width, center.y, currentImage.size.width, currentImage.size.height); 
    [self addSingleCroppedImage:currentImage at:frame byCircleAt:center withRadius:radius]; 

    // lower right 

    currentImage = dog4; 
    frame = CGRectMake(center.x, center.y, currentImage.size.width, currentImage.size.height); 
    [self addSingleCroppedImage:currentImage at:frame byCircleAt:center withRadius:radius]; 
}