如何用NSString标签识别视图？

Question

view.tag仅存储NSInteger Value.

那么,如何用NSString Value识别每个视图？

不可用？

一些例子:

view0.stringTag = @"basic";

view1.stringTag = @"advanced";

Answer 1

没有stringTag财产UIView.如果您需要执行此类操作,可以使用类别UIView并将标记存储在关联对象中:

@interface UIView (StringTagAdditions)
@property (nonatomic, copy) NSString *stringTag;
@end

@implementation UIView (StringTagAdditions)
static NSString *kStringTagKey = @"StringTagKey";
- (NSString *)stringTag
{
    return objc_getAssociatedObject(self, kStringTagKey);
}
- (void)setStringTag:(NSString *)stringTag
{
    objc_setAssociatedObject(self, kStringTagKey, stringTag, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
@end

Answer 2

if use ARC

#import "UIView.h"
#import <objc/runtime.h>

@implementation UIView (StringTagAdditions)
static NSString *kStringTagKey = @"StringTagKey";
- (NSString *)stringTag
{
    return objc_getAssociatedObject(self, CFBridgingRetain(kStringTagKey));
}
- (void)setStringTag:(NSString *)stringTag
{
    objc_setAssociatedObject(self, CFBridgingRetain(kStringTagKey), stringTag, OBJC_ASSOCIATION_COPY_NONATOMIC);
}

@end

Answer 3

不,你不能使用字符串.如果您的目标是代码可读性,则可以使用枚举.但是,请务必从1开始枚举,因为0是所有视图的默认标记:

typedef enum {
    vtBasic = 1,
    vtAdvanced
} ViewType;
...
view0.tag = vtBasic;