UITextView/UITextField的虚线/虚线边框 [英] Dotted / Dashed border for UITextView / UITextField

问题描述

我想为我的UITextField和UITextView设置虚线/虚线边框.

我该怎么做?我知道，我可以使用以下代码行设置边框:

How can I do that? I know that, I can set border with this line of code:

[self.textFieldCardTitle.layer setBorderWidth:1.0];
[self.textFieldCardTitle.layer setBorderColor:[[UIColor whiteColor] CGColor]];  

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注意::我已经有了在UITextView后面添加UIImageView并在其中设置带有虚线边框的图像的想法.但是我不想那样解决.

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Notice: I already have the idea to add a UIImageView behind the UITextView and set there an image with dashed border. But I don't want to solve it that way.

推荐答案

例如，您可以尝试以下方法:

You could try, for example, next approach:

1)创建代表边框的图像(例如:一个点和一个空格)

1) Create image that will represent your border (for example: one dot and space)

2)将图像添加到项目中.

2) Add image to project.

3)设置边框(如您问题中的代码所示)，并使用图案设置颜色:

3) Set border (as in code in your question) and set color with pattern:

[self.textFieldCardTitle.layer setBorderWidth:6.0];
[self.textFieldCardTitle.layer setBorderColor:[[UIColor colorWithPatternImage:[UIImage imageNamed:@"dashed_white.png"]] CGColor]];

当边框沿4个侧面(左侧，右侧，底部，顶部)绘制时，您应该使用正方形图像:例如，中间的像素是黑色的，周围的像素是透明的.因此，该图像的副本将放置在视图周围.

As border is drawn along 4 sides (left, right, bottom, top) you should use square image: for example, pixel in middle is black and pixels around it are transparent. So copies of that image will be placed around the view.

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