iPhone How-to:給UIView拍照

發布時間：2020-06-26 11:47:52 來源：網絡閱讀：386 作者：benjielin 欄目：開發技術

基本原理就是主要將UIView的layer描繪到圖形上下文。UIView全局拍照和局域拍照的代碼如下：

1 UIView全局拍照

- (UIImage *) screenImage:(UIView *)view {
UIImage *screenImage;

    UIGraphicsBeginImageContext(view.frame.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    screenImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return screenImage;
}

2 UIView局域拍照

- (UIImage *) screenImage:(UIView *)view rect:(CGRect)rect {
CGPoint pt = rect.origin;
UIImage *screenImage;

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextConcatCTM(context,
            CGAffineTransformMakeTranslation(-(int)pt.x, -(int)pt.y));
    [view.layer renderInContext:context];
    screenImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return screenImage;
}

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