UITextView字体是零 [英] UITextView font is nil

问题描述

我在故事板中创建了一个字体大小为14的UITextView，并将其连接到ViewController的detailDescriptionLabel属性。此代码在viewDidLoad中：

  self.detailDescriptionLabel.font = [UIFont systemFontOfSize：10]; 
 NSLog（@text is％@; font is％@，self.detailDescriptionLabel.text，self.detailDescriptionLabel.font）; 
  

控制台输出如下：

 文本是Lorem Ipsum;字体为（空）
  

为什么字体设置为零？ setFont：正在工作;字体确实收缩。我想获得字体，所以在手势后我可以调用lineHeight的字体。通过这种方式，我可以找出哪一行已经被点击了下面的代码：

$ $ p $ $ $ $ $ $> int line = [tap locationInView：tap。查看] .y / self.detailDescriptionLabel.font.lineHeight;

字体也是零。行被设置为-2147483648，这显然不是我想要的。尝试检查这个UITextView的'selectable'复选框在Interface Builder中，如果你没有选中它（它在属性检查器中）。

我刚遇到类似的问题。我有一个UITextView的字体属性为零的IBOutlet，它将不会响应任何字体或文本颜色的代码更改，直到之后的文本属性被设置。我能够通过试验和错误的方式将问题的根源缩小到特定的复选框，但我无法解释它为什么会起作用（看起来像一个系统错误）。

I created a UITextView with a font size of 14 in a storyboard and hooked it up to the detailDescriptionLabel property of my ViewController. This code is in viewDidLoad:

self.detailDescriptionLabel.font=[UIFont systemFontOfSize:10];
NSLog(@"text is %@; font is %@", self.detailDescriptionLabel.text, self.detailDescriptionLabel.font);

The console output follows:

text is Lorem Ipsum; font is (null)

Why is the font set to nil? The setFont: is working; the font does shrink. I want to get the font so after a gesture I can call lineHeight on the font. This way, I can find out which line has been tapped with the following code:

int line = [tap locationInView:tap.view].y / self.detailDescriptionLabel.font.lineHeight;

Here, too, the font is nil. line is set to -2147483648, which is obviously not what I want.

解决方案

Try checking the 'selectable' checkbox for this UITextView in Interface Builder, if you have it unchecked (it's in the Attributes Inspector).

I just encountered similar issue. I had an IBOutlet to a UITextView whose font property was nil, and it would not respond to any font or text-color changes in code until after its text property had been set. I was able to narrow down the source of the problem to this particular checkbox through trial and error, but I can't explain why it works (seems like a system bug).

这篇关于UITextView字体是零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！