當(dāng)向類別中添加自定義屬性時會報instance variables may not be placed in categories錯誤，還好我們有了runtime，我們可以通過runtime的Associate為類別添加屬性
@interface UIView (LFEaseBlankPageView)
{
NSString *test;/*報錯instance variables may not be placed in categories */
}
@end
正確做法如下：
static char BlankPageViewKey;
- (void)setBlankPageView:(LFEaseBlankPageView *)blankPageView{
[self willChangeValueForKey:@"BlankPageViewKey"];
objc_setAssociatedObject(self, &BlankPageViewKey,
blankPageView,
OBJC_ASSOCIATION_RETAIN_NONATOMIC);
[self didChangeValueForKey:@"BlankPageViewKey"];
}
- (LFEaseBlankPageView *)blankPageView{
return objc_getAssociatedObject(self, &BlankPageViewKey);
}
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