1、 Implicit conversion of 'BOOL' (aka 'signed char') to 'id' is disallowed with ARC
解决：
[NSNumbernumberWithBool:value]
2、-[UILabel copyWithZone:]: unrecognized selector sent to instance
解决：UILabel不能为title
3、ios使用AdMob出错-[GADObjectPrivate changeState:]: unrecognized selector sent
解决方法：在Build
Settings 中的Other Linker Flags中加入-ObjC
4、
-[__NSCFString absoluteURL]: unrecognized selector sent to instance 0xbb9e240
解决方法：问题出在编写nsurl的时候直接用string了，setURL:string]];改为setURL:[NSURL
URLWithString:string]];