解决方法，将变量
@property (assign) UILabel *titleView;
改为
@property (retain) UILabel *titleView;
Assigning retained object to unsafe property;object will be released after assignment
【上篇】ie6 span 换行解决span float:right不能右对齐而是换行显示
【下篇】capturing self strongly in this block is likely to lead to a retain cycle
【下篇】capturing self strongly in this block is likely to lead to a retain cycle