1、 Implicit conversion of 'BOOL' (aka 'signed char') to 'id' is disallowed with ARC
解決：
[NSNumbernumberWithBool:value]
2、-[UILabel copyWithZone:]: unrecognized selector sent to instance
解決：UILabel不能爲title
3、ios使用AdMob出錯-[GADObjectPrivate changeState:]: unrecognized selector sent
解決方法：在Build
Settings 中的Other Linker Flags中加入-ObjC
4、
-[__NSCFString absoluteURL]: unrecognized selector sent to instance 0xbb9e240
解決方法：問題出在編寫nsurl的時候直接用string了，setURL:string]];改爲setURL:[NSURL URLWithString:string]];