我们知道 在iOS中cagetory里面只能添加方法 ，如果我们想添加属性 就要用到
<objc/runtime.h>
中
OBJC_EXPORT void objc_setAssociatedObject(idobject, constvoid *key, id value, objc_AssociationPolicy policy)
__OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_1);
OBJC_EXPORT id objc_getAssociatedObject(idobject, constvoid *key)
__OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_1);
例如
@interface UIButton(custom)
@property (nonatomic, copy) NSIndexPath *selectIndexPath;
@end
staticNSIndexPath *k_SelectIndexPath;
@implementation UIButton(custom)
@dynamic selectIndexPath;
- (void)setSelectIndexPath:(NSIndexPath *)selectIndexPath
{
objc_setAssociatedObject(self, &k_SelectIndexPath, selectIndexPath, OBJC_ASSOCIATION_COPY);
}
- (NSIndexPath*)selectIndexPath
{
returnobjc_getAssociatedObject(self, &k_SelectIndexPath);
}
@end
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