具有边到边排除路径的UiTextView会导致所有文本消失 [英] UiTextView with edge to edge exclusion path cause all the text to disappear

问题描述

我有一个 UITextView ，我想为它添加一个自定义的 UIView ，并使文本在上面流动，如下所示：

I have a UITextView and i want to add a custom UIView to it and make the text flow above and below like so:

+----------------+
|------txt-------|
|                |
|     UIView     |   
|                |
|------txt-------|
|----------------|
|----------------|
+----------------+

我试图通过添加一个具有 UITextView 宽度的排除路径以及 UIView 的高度来实现这一点：

I tried to achieve this by adding an exclusion path that has the UITextView width and the UIView's height like so:

CGRect exclusionFrame=CGRectMake(0, 
                                CGRectGetMinY(element.frame),
                                self.textView.textContainer.size.width,
                                CGRectGetHeight(element.frame)); 
self.textView.textContainer.exclusionPaths=@[[UIBezierPath bezierPathWithRect:exclusionFrame]];

但由于某种原因，如果排除路径的宽度等于textView的宽度，则<$ c下面的所有文本$ c> UIView （又名元素）消失。当我将排除路径的宽度减少一个时，文本显示为 UiView 旁边的一个字母列，如下所示：

But for some reason if the exclusion path's width equal the textView's width all the text below the UIView (aka element) disappear. When i reduce the exclusion path's width by one the text appear with a one letter column next to the UiView like this:

+----------------+
|------txt-------|
|a               |
|d     UIView    |   
|e               |
|------txt-------|
|----------------|
|----------------|
+----------------+

为什么我不能创建边缘到边缘的排除路径，是否有解决这种困境的方法？

Why can't i create a edge to edge exclusion path and is there a way around this predicament?

推荐答案

最终成为故事板。我只从视图中取出UiTextView并以编程方式初始化它似乎解决了问题：

It ended up being the storyboard. I took only the UiTextView out of the view and initialized it programmatically that seemed to solve the problem:

-(void) viewDidLoad{
    self.textView=[[UITextView alloc] init];
    self.textView.translatesAutoresizingMaskIntoConstraints=NO;
    [self.view addSubview:self.textView];

    NSDictionary* views = @{@"textView": self.textView};
    NSArray* vContrains=[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[textView]-50-|" options:NSLayoutFormatAlignAllLeft metrics:nil views:views];
    NSArray* hContrains=[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[textView]-50-|" options:NSLayoutFormatAlignAllLeft metrics:nil views:views];
    [self.view addConstraints:vContrains];
    [self.view addConstraints:hContrains];

} 

这篇关于具有边到边排除路径的UiTextView会导致所有文本消失的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！