[英]Can I customize existing viewWithTag:(NSInteger) method for stringTag?
請幫助我,我一直在自定義UIView類以將NSString值設置為標記,但是如何從視圖層次結構中獲取該視圖。在UIView類中獲取視圖的默認方法是viewWithTag:(NSInteger)
。
請看下面的代碼
#import <UIKit/UIKit.h>
@interface UIView (StringTag)
@property (nonatomic, copy) NSString *tagString;
@end
#import "UIView+StringTag.h"
#import <objc/runtime.h>
static const void *tagKey = &tagKey;
@implementation UIView (StringTag)
- (void)setTagString:(NSString *)tagString
{
objc_setAssociatedObject(self, tagKey, tagString,OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (id)tagString
{
return objc_getAssociatedObject(self, tagKey);
}
@end
我想要一個像viewWithStringTag:(NSString *)stringTag
。
謝謝,
使用遞歸搜索,包括自我
#import <UIKit/UIKit.h>
@interface UIView (StringTag)
@property (nonatomic, copy) NSString *tagString;
- (UIView *)viewWithStringTag:(NSString *)strTag;
@end
#import "UIView+StringTag.h"
#import <objc/runtime.h>
static const void *tagKey = &tagKey;
@implementation UIView (StringTag)
- (void)setTagString:(NSString *)tagString
{
objc_setAssociatedObject(self, tagKey, tagString,OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (id)tagString
{
return objc_getAssociatedObject(self, tagKey);
}
- (UIView *)viewWithStringTag:(NSString *)strTag{
if ([self.tagString isEqual:strTag]){
return self;
}
if (!self.subviews.count){
return nil;
}
for (UIView *subview in self.subviews){
UIView *targetView = [subview viewWithStringTag:strTag];
if (targetView){
return targetView;
}
}
return nil;
}
@end
這是我的測試代碼
- (void)viewDidLoad {
[super viewDidLoad];
UIView *aView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
aView.tagString = @"aView";
UIView *bView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
bView.tagString = @"bView";
[self.view addSubview:aView];
[aView addSubview:bView];
UIView *targetView = [self.view viewWithStringTag:@"bView"];
NSLog(@"%@", targetView);
// <UIView: 0x7f933bc21e50; frame = (0 0; 100 100); layer = <CALayer: 0x7f933bc1c430>>
}
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