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【画像を保存]UIViewを画像で保存する。

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UIView を見た目そのまま画像として保存したい。

saveImage.m
//Core Graphicsを使います
#import <QuartzCore/QuartzCore.h>
//保存したい UIView のインスタンス view があるとして、それを保存する方法は次の通り。
UIGraphicsBeginImageContext(view.frame.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    // PNGの場合(view.alphaで指定した透明度も維持されるみたい)
    NSData *dataSaveImage = UIImagePNGRepresentation(image);

    // JPEGの場合
    //NSData *dataSaveImage = UIImageJPEGRepresentation(image, 1.0);    

    // Documentsディレクトリに保存
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    [dataSaveImage writeToFile:[path stringByAppendingPathComponent:@"test.png"] atomically:YES];

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