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我在视图控制器上添加了一个 UIView。最初我在 UIView 上设置了边框颜色，现在它看起来很平滑。但是通过手势识别器缩放该视图时，边框颜色会被像素化。

下面的初始代码

- (id)initWithImage:(UIImage*)image delegate:(id)delegat{
    if ( (self = [super initWithImage:image]) ) {
        self.layer.masksToBounds = YES;
        self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width+1, self.frame.size.height+1);
        self.contentMode = UIViewContentModeCenter;
        ratio = image.size.height / image.size.width;
        itemType = 2;
        self.userInteractionEnabled =TRUE;
        self.delegate = delegat;
        self.layer.borderColor = [UIColor redColor].CGColor;
        self.layer.borderWidth = 4;
        scaleFactor = 1.0;
        rotateAngle = 0.0;
        fontSize = 22;
        self.contentScaleFactor = 1.0;
        if(image != nil){
            frameWidth = image.size.width;
            frameHeight = image.size.height;
        }else{
            frameWidth = self.frame.size.width;
            frameHeight = self.frame.size.height;    
        }

        [self addGestureRecognizers];
    }    
    return self;
}

在此处输入图像描述

这是旋转代码的代码

- (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer{


    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
        // To undo the action : store information
        [[UIAppDelegate viewController] storeAction:CHUndoActionTypeRotate item:self];

        [gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
        [gestureRecognizer setRotation:0];
    }

}

这是我在旋转视图时得到的

在此处输入图像描述

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1 回答 1

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这是一个看似很常见的问题。您想要的是对边界进行抗锯齿处理。 这是一个有解决方案的帖子，这是另一个。

基本上，您可以使用 UIImageView 并在图像周围添加一个像素透明边框，以便实际边框消除锯齿。

于 2012-06-29T14:43:35.853 回答