Question

我有UIView显示图表..现在我需要将其捕获到UIImage并且我用Google搜索它并得到以下代码。但是如果我在我的代码中使用它不起作用。即使我使用断点编译器也没达到这个。我在UIView中使用它。我出错了？

+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;
}

Answer 1

您可以使用以下方法

截取iPhone应用程序的任何视图或整个屏幕的屏幕截图

- (UIImage *)captureView {

//hide controls if needed
CGRect rect = [self.view bounds];

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;

}

并称它为吼叫......

UIImage *tempImageSave=[self captureView];

您还可以使用此相册的波纹线保存此图像..

UIImageWriteToSavedPhotosAlbum(tempImageSave,nil,nil,nil);

您还可以使用此文档目录的下方行保存此图像。

NSData *imageData = UIImagePNGRepresentation(tempImageSave);
NSFileManager *fileMan = [NSFileManager defaultManager];

NSString *fileName = [NSString stringWithFormat:@"%d.png",1];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
[fileMan createFileAtPath:pdfFileName contents:imageData attributes:nil];

如果视图包含图层图像或某些图形相关数据，请使用以下方法。

-(UIImage *)convertViewToImage:(UIView *)viewTemp
{
    UIGraphicsBeginImageContext(viewTemp.bounds.size);
    [viewTemp drawViewHierarchyInRect:viewTemp.bounds afterScreenUpdates:YES];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;

}

并使用如下方法。

UIImage *tempImageSave = [self convertViewToImage:yourView];

我希望这对你有帮助。

Answer 2

您可以像这样保存View的图像并将图像存储到文档目录中： -

-(void)SaveViewAsImage
{
    UIGraphicsBeginImageContext(self.view.bounds.size);

        UIImage *saveImage = UIGraphicsGetImageFromCurrentImageContext();
        [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
        UIGraphicsEndImageContext();
        NSData *imageData = UIImagePNGRepresentation(saveImage);
        NSFileManager *fileMan = [NSFileManager defaultManager];

        NSString *fileName = [NSString stringWithFormat:@"%d.png",1];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];
        [fileMan createFileAtPath:pdfFileName contents:imageData attributes:nil];

}

您的图像保存在文档目录中：）

下载此演示

http://www.sendspace.com/file/gjxa82

Answer 3

尝试使用此代码可能会对您有所帮助

- (UIImage *)captureView:(UIView *)view {
    CGRect screenRect = [[UIScreen mainScreen] bounds];

    UIGraphicsBeginImageContext(screenRect.size);

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor clearColor] set];
    CGContextFillRect(ctx, screenRect);

    [view.layer renderInContext:ctx];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return newImage;
}

Howe捕获UIView顶级UIView

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