objective-c - 分配字符串时发送到实例的无法识别的选择器

Question

我有一个自定义按钮，我想为其分配一个字符串，然后将该按钮作为参数传递到@selector 中。出于这个原因，在头文件 CustomButton 中我放置了一个属性“name”。但是，当我将字符串分配给按钮时，出现此错误。

'NSInvalidArgumentException', reason: '-[UIButton setName:]: unrecognized selector sent 
to instance 0x8484560'

这是什么意思？

CustomButton.h中的代码:

 @interface CustomButton : UIButton

 @property (nonatomic, strong)NSString * name;

 @end

CustomButton.m中的代码:

 @synthesize name;

在 MapViewController.m 中

CustomButton *rightButton = [CustomButton buttonWithType:UIButtonTypeInfoLight];

NSLog(@"The button is %@", rightButton);
/*The button is <UIButton: 0x8484560; frame = (0 0; 18 19); opaque = NO; layer = 
  <CALayer: 0x8484670>>*/

rightButton.name = self.nameTable; //the error is here

Answer 1

所以，我有一个类似的“自定义按钮”，它似乎工作正常:

CustomButton* btn = [CustomButton buttonWithType:UIButtonTypeCustom];
[btn setName:@"Road Runner"];
//OR 
btn.name = @"Road Runner";

NSLog(@"Custom button %@", btn);
/*
OUTPUT: <CustomButton: 0x68283f0; baseClass = UIButton; frame = (0 0; 0 0); 
opaque = NO; layer = <CALayer: 0x6828500>>
*/

NSLog(@"Button's name is %@", btn.name);
/* 
OUTPUT: Road Runner //the name that was set earlier
*/

因此，请检查您是否正确创建了 CustomButton 类，因为对于您来说，在控制台中显示的是 UIButton。