非目标C指针类型“char *”到“NSString *”的隐式转换不允许使用ARC [英] Implicit conversion of a non-Objective-C pointer type 'char *' to 'NSString *' is disallowed with ARC

问题描述

对于下面的代码行，我得到以下错误：

  for（UILabel * label in labels）{
 label.text = label.tag-100> someMutableString.length？ ：*; 
} 
  

错误状态：

使用ARC不允许非目标C指针类型char *到NSString *的隐式转换

我的变量someMutableString的类型为NSMutableString。

如何解决我的特殊情况？

<问题是你的字符串字面量是和*

/ code>都是C风格的字符串（ const char * ）。因此，右侧的类型也是 const char * 。您正在分配 UILabel 的文本属性，该属性需要一个 NSString 。

使用 @和 @* code>。

For the following line of code I am getting the error below:

for (UILabel *label in labels) {
    label.text = label.tag - 100 > someMutableString.length ? "" : "*";
}

The error states:

Implicit conversion of a non-Objective-C pointer type 'char *' to 'NSString *' is disallowed with ARC

My variable "someMutableString" is of type NSMutableString.

How do I fix in my particular case?

解决方案

The problem is that your string literals are "" and "*" which are both C-style strings (const char*). So the type of the right hand side of the assignment is also const char*. You are assigning to the text property of a UILabel, which takes an NSString.

Use @"" and @"*" instead.

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