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// UIImage を PNG画像データへ変換する
+ (BOOL)saveUIImage2PNG:(UIImage *)image FileName:(NSString *)fileName
{
    NSData *data = UIImagePNGRepresentation(image);  
    NSString *pngFilePath = [NSString stringWithFormat:@"%@/%@.png", [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"], fileName];  
    NSLog(@"%@", pngFilePath);
 
    BOOL result;
    if ([data writeToFile:pngFilePath atomically:YES]) {
        result = YES;
    } 
    else {
        result = NO;
    }
 
    return result;
}
 
// Viewイメージをキャプチャーする
// 備考: 画面に表示していなくてもキャプチャーできる
+ (UIImage *)captureViewImage:(UIView *)view 
{   
    UIImage *capture; 
 
    UIGraphicsBeginImageContext(view.bounds.size);
 
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    capture = UIGraphicsGetImageFromCurrentImageContext();
 
    UIGraphicsEndImageContext();
 
    return capture;
}

// UIImage を PNG画像データへ変換する + (BOOL)saveUIImage2PNG:(UIImage *)image FileName:(NSString *)fileName { NSData *data = UIImagePNGRepresentation(image); NSString *pngFilePath = [NSString stringWithFormat:@"%@/%@.png", [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"], fileName]; NSLog(@"%@", pngFilePath); BOOL result; if ([data writeToFile:pngFilePath atomically:YES]) { result = YES; } else { result = NO; } return result; } // Viewイメージをキャプチャーする // 備考: 画面に表示していなくてもキャプチャーできる + (UIImage *)captureViewImage:(UIView *)view { UIImage *capture; UIGraphicsBeginImageContext(view.bounds.size); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; capture = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return capture; }