UIView 只设置侧边框 [英] UIView set only side borders

问题描述

有没有办法将 UIView 的边框的边设置为一种颜色，而将顶部和底部保留另一种颜色?

Is there a way to set the sides of the border of a UIView to one color and leave the top and the bottom another?

推荐答案

不——CALayer 边框不支持这种行为.实现您想要的最简单的方法是添加一个 n 点宽的不透明子视图，并在视图的每一侧添加您想要的边框颜色作为其背景颜色.

Nope—CALayer borders don’t support that behavior. The easiest way to accomplish what you want is adding an n-point-wide opaque subview with your desired border color as its background color on each side of your view.

示例:

CGSize mainViewSize = theView.bounds.size;
CGFloat borderWidth = 2;
UIColor *borderColor = [UIColor redColor];
UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, borderWidth, mainViewSize.height)];
UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(mainViewSize.width - borderWidth, 0, borderWidth, mainViewSize.height)];
leftView.opaque = YES;
rightView.opaque = YES;
leftView.backgroundColor = borderColor;
rightView.backgroundColor = borderColor;

// for bonus points, set the views' autoresizing mask so they'll stay with the edges:
leftView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleRightMargin;
rightView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin;

[theView addSubview:leftView];
[theView addSubview:rightView];

[leftView release];
[rightView release];

请注意，这与 CALayer 边框的行为不太匹配——左右边框视图将始终位于其父视图的边界内.

Note that this won’t quite match the behavior of CALayer borders—the left and right border views will always be inside the boundaries of their superview.

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