Objective-C 编码规范

代码组织

在函数分组和protocol／delegate 实现中使用 ＃pragma mark －来分类方法，要遵循以下结构

#pragma mark - lifeCycle

#pragma mark - custom Accessors

#pragma mark - IBActions

#pragma mark - public

#pragma mark - private

#pragma mark - protocol

#pragma mark - delegate

#pragma mark - NSCopying

#pragma mark - NSObject