ios - 如何添加实例变量并在自定义 UIButton 中使用它

Question

我像这样创建了一个自定义 UIButton

@interface CustomButton : UIButton {

    NSString *firstLine;
    NSString *secondLine;
}
@property (nonatomic, retain) NSString *firstLine;
@property (nonatomic, retain) NSString *secondLine;

@end

CustomButton* rightButton = [CustomButton buttonWithType:UIButtonTypeDetailDisclosure];
rightButton.secondLine=@"hello";

错误信息是:

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[UIButton setSecondLine:]: unrecognized selector sent to instance 0x43280e0'

要解决这个问题需要做什么？实例变量应该如何添加？

Answer 1

尝试

rightButton.secondLine = @"hello";

---

你应该覆盖这个类的方法

+ (id)buttonWithType:(UIButtonType)buttonType

返回自定义按钮的实例