ios bug 汇总

一 错误：'release' is unavailable: not available in automatic reference counting mode..(Xcode4.2.1+iOS5.0)
解决办法：（老外的话）
You need to turn off Automatic Reference Counting. You do this by clicking on your project in the navigator (the top item in the finder-like thing on the left), then click on your target, select "Build Settings" and turn off the option "Objective-C Automatic Reference Counting" (you can use the search field on the upper right to search it).
在项目导航栏 视图模式下里 ，选中即点击你出错的项目（target），代码编辑视图会切换为项目属性列表视图，选择Building Setting选项卡，之后在搜索框中搜索关键字Automatic你会在搜索列表中发现 有这么一项 Objective-C Automatic Reference Counting ， 吧该值切换为NO（取消自动释放模式）即可。