如何将字符串作为UIButton的标记传递

Question

标记值是整数:

UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:addressField forState:UIControlStateNormal];
[button addTarget:self action:@selector(pickTheQuiz:) forControlEvents:UIControlEventTouchUpInside];
button.tag=1;//or what other integer value, i need to put a string value

在接收方法中:

-(void)pickTheQuiz:(id)sender{           
    NSLog(@"The part number is:%i",((UIControl*)sender).tag);//i need to receive a string value instead of numeric value
}

Answer 1

您可以将标记的整数值转换为NSString:

[NSString stringWithFormat:@"%i", ((UIControl*)sender).tag];

或者,如果您确实需要一个字符串作为UI对象的标识符,只需将其子类化并添加如下属性:

@property (nonatomic, strong) NSString *stringID;

然后使用它而不是使用tag属性.

Answer 2

你可以在功能objc_runtime的帮助下做到这一点

#import <objc/runtime.h>

static char kButtonAssociatedKey;

NSString *aStrKey = [NSString stringWithFormat:@"Any Key"];
UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:addressField forState:UIControlStateNormal];
[button addTarget:self action:@selector(pickTheQuiz:) forControlEvents:UIControlEventTouchUpInside];
button.tag=1;

objc_setAssociatedObject(button,
                         &kButtonAssociatedKey,
                         aStrKey,
                         OBJC_ASSOCIATION_RETAIN_NONATOMIC);

-(void)pickTheQuiz:(id)sender
{
    NSString *aStrKey = objc_getAssociatedObject(sender, &kButtonAssociatedKey);
    objc_removeAssociatedObjects(sender);
    NSLog(@"%@", aStrKey);
}