1 has been modified since the precompiled header was built
解決方案：clean 一下，再運作就可以了。
2 ARC禁止使用release
錯誤資訊：
/Users/zhangyuc/Desktop/IOSNewStart/UILocalizedIndexedCollationTest/UILocalizedIndexedCollationTest/ZYViewController.m:32:4: ARC forbids explicit message send of 'release'
解決方案：設定Objective-C Automatic Reference Counting為NO
附圖：
![【iOS 開發】基礎控件：UILabeliOS 開發之基礎控件 UILabel[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)