使用CATransform3DRotate时的抗锯齿行

我将答案中的代码复制到How do I apply a perspective transform to a UIView?以获得以下图像。但请注意，锯齿线将水平分开。是否有必要以反锯齿这些锯齿线的方式进行这种视角转换？使用CATransform3DRotate时的抗锯齿行

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编辑我试着通过DarkDust在这个帖子上的评论所提供的解决方案。没有任何工作。这里是我的代码：

levelView = [[UIControl alloc] initWithFrame:CGRectMake(100, 60, 160, 230)]; 
    [self addSubview:levelView]; 
    levelView.transform = CGAffineTransformScale(self.transform, .8, .8); 

    CALayer *layer = levelView.layer; 

    //DarkDust's 2nd comment 
    layer.borderWidth = 1; 
    layer.borderColor = [[UIColor clearColor] CGColor]; 

    CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity; 
    rotationAndPerspectiveTransform.m34 = 1.0/1000; 
    rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, 45.0f * M_PI/180.0f, 0.0f, 1.0f, 0.0f); 
    layer.transform = rotationAndPerspectiveTransform; 

    for (NSString *ID in [NSArray arrayWithObjects:@"Level 1", @"Level 2", @"Level 3", @"Level 4", @"Level 5", nil]) { 

     //Note the offset of 5 from the superview in both X and Y directions. This addresses DarkDusk's first comment 
     UIControl *ctrl = [[UIControl alloc] initWithFrame:CGRectMake(5, y + 5, levelView.frame.size.width, 220/5)]; 
     [levelView addSubview:ctrl]; 
     [ctrl addTarget:self action:@selector(languageSelected:) forControlEvents:UIControlEventTouchDown]; 
     [self styleEnabled:ctrl];    

     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(13, 0, ctrl.frame.size.width - 13, ctrl.frame.size.height)]; 
     [ctrl addSubview:label]; 
     label.text = ID; 
     label.font = [UIFont systemFontOfSize:20]; 
     label.textColor = [UIColor colorWithRed:1 green:1 blue:1 alpha:.8]; 
     label.backgroundColor = [UIColor clearColor]; 

     y += ctrl.frame.size.height; 
    }

水平按钮，你在图片中看到是UIControl所有实例，他们是UIControl *levelView直接子视图。 levelView是一个正在转变。

DarkDusk的其他两个评论特指UIImages，我不使用它。如果他们仍然适用，有人可以解释如何实施他们，我一定会给他们一个镜头。

来源

2012-01-14 maxedison

的可能重复的[iPhone：CALayer的+在3D +反锯齿旋转]（http://stackoverflow.com/questions/2686027/iphone-calayer-rotate-in-3d-antialias） – DarkDust 2012-01-14 16:11:36

参见重复。你可以通过简单的做'layer.borderWidth = 1; layer.borderColor = [[UIColor clearColor] CGColor];' – DarkDust 2012-01-14 16:13:41

另请参见[CALayer的抗混叠对角线边缘]（http://stackoverflow.com/questions/6245276/anti-alias-diagonal-edges-of-calayer） – DarkDust 2012-01-14 16:15:47

iOS 7带来了一个新的属性allowsEdgeAntialiasing到CALayer，你可以看到here。当设置为YES时，您的图层将转换为消除锯齿的边缘。

/* When true this layer is allowed to antialias its edges, as requested 
* by the value of the edgeAntialiasingMask property. 
* 
* The default value is read from the boolean UIViewEdgeAntialiasing 
* property in the main bundle's Info.plist. If no value is found in 
* the Info.plist the default value is NO. */ 

@property BOOL allowsEdgeAntialiasing;

来源

2014-09-22 08:58:54

在plist编辑器中，该值被命名为“带边缘抗锯齿渲染”。 – 2015-01-29 20:58:28

使用CATransform3DRotate时的抗锯齿行

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