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当我使用下面的代码以编程方式截取屏幕截图时，它会在状态栏所在的位置留下一个白色条带。我知道您无法捕获状态栏，但我只想裁剪掉白色的空白条。

- (UIImage*)captureView:(UIView *)view
{
CALayer *layer = [[UIApplication sharedApplication] keyWindow].layer;
CGFloat scale = [UIScreen mainScreen].scale;
UIGraphicsBeginImageContextWithOptions(layer.frame.size, NO, scale);

[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;

}
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1 回答 1

2

我从另一个问题https://stackoverflow.com/a/16067463/837244复制了我的答案，它应该可以解决您的问题：

我以前在小班下面写过这个。你可以利用它。后一个函数获取整个屏幕的截图（并且它是从苹果的指南中获得的，所以它绝对是安全的）。我添加的第一部分处理不同的比例（视网膜或常规）。愿它有所帮助。

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

@implementation ScreenshotTaker


+(UIImage *) captureRectOfScreen:(CGRect) rect
{
    UIImage *wholeScreen = [ScreenshotTaker screenshot];

    //Add status bar height
    rect.origin.y += UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) ? [[UIApplication sharedApplication] statusBarFrame].size.width : [[UIApplication sharedApplication] statusBarFrame].size.height;

    //NSLog(@"%@",NSStringFromCGSize([wholeScreen size]));

    CGFloat scale = wholeScreen.scale;

    rect.origin.x *= scale;
    rect.origin.y *= scale;
    rect.size.width *= scale;
    rect.size.height *= scale;

    UIImage *cropped = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([wholeScreen CGImage], rect) scale:wholeScreen.scale orientation:wholeScreen.imageOrientation];

    //NSLog(@"Whole Screen Capt :%@ Scale: %f",NSStringFromCGSize([wholeScreen size]), wholeScreen.scale);
    //NSLog(@"Rect to Crop :%@ Cropped :%@",NSStringFromCGRect(rect), NSStringFromCGSize([cropped size]));

    return cropped;
}

+(UIImage *) screenshot
{
    // Create a graphics context with the target size
    // On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
    // On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
    CGSize imageSize = [[UIScreen mainScreen] bounds].size;
    if (NULL != UIGraphicsBeginImageContextWithOptions)
        UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    else
        UIGraphicsBeginImageContext(imageSize);

    CGContextRef context = UIGraphicsGetCurrentContext();

    // Iterate over every window from back to front
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
        {
            // -renderInContext: renders in the coordinate space of the layer,
            // so we must first apply the layer's geometry to the graphics context
            CGContextSaveGState(context);
            // Center the context around the window's anchor point
            CGContextTranslateCTM(context, [window center].x, [window center].y);
            // Apply the window's transform about the anchor point
            CGContextConcatCTM(context, [window transform]);
            // Offset by the portion of the bounds left of and above the anchor point
            CGContextTranslateCTM(context,
                                  -[window bounds].size.width * [[window layer] anchorPoint].x,
                                  -[window bounds].size.height * [[window layer] anchorPoint].y);

            // Render the layer hierarchy to the current context
            [[window layer] renderInContext:context];

            // Restore the context
            CGContextRestoreGState(context);
        }
    }

    // Retrieve the screenshot image
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;
}

@end
于 2013-04-26T23:55:16.633 回答