iOS常见bug

1、

Undefined symbols for architecture i386:
"_SCNetworkReachabilityCreateWithAddress", referenced from:
"_SCNetworkReachabilityGetFlags", referenced from:

解决办法：添加SystemConfiguration.framework

2、这个是引用NSDataAdditions时出现的bug，

"_deflate", referenced from:
      -[NSData(NSDataAdditions) gzipDeflate] in NSDataAdditions.o
  "_deflateEnd", referenced from:
      -[NSData(NSDataAdditions) gzipDeflate] in NSDataAdditions.o
  "_deflateInit2_", referenced from:
      -[NSData(NSDataAdditions) gzipDeflate] in NSDataAdditions.o
  "_inflate", referenced from:
      -[NSData(NSDataAdditions) gzipInflate] in NSDataAdditions.o
  "_inflateEnd", referenced from:
      -[NSData(NSDataAdditions) gzipInflate] in NSDataAdditions.o
  "_inflateInit2_", referenced from:
      -[NSData(NSDataAdditions) gzipInflate] in NSDataAdditions.o

解决办法：添加libz.dylib类库 

3. selector警告 

performSelector may cause a leak because its selector is unknown 

触发原因

SEL sel = @selector(touch:);
[self performSelector:sel withObject:textField];

解决办法 

#import <objc/message.h>
SEL sel = @selector(touch:);
objc_msgSend(self, sel, textField);// textField为touch：后跟的参数，如有多个参数，用','连接即可