创建Category;

创建Objective-C file文件，下图File为类别名,Class为需要添加属性的原生类

类别创建

以UITextField为例；

.h文件

@interfaceUITextField (IndexPath)

@property (nonatomic,strong) NSIndexPath *indexPath;//增加indexPath属性

@end

.m文件

#import "UITextField+IndexPath.h"

#import

@implementationUITextField (IndexPath)

staticcharindexPathKey;

- (NSIndexPath*)indexPath{

    return objc_getAssociatedObject(self, &indexPathKey);

}

- (void)setIndexPath:(NSIndexPath*)indexPath{

    objc_setAssociatedObject(self, &indexPathKey, indexPath,OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

@end