摘要： #ifdef __IPHONE_5_0 float version = [[[UIDevice currentDevice] systemVersion] floatValue]; if (version >= 5.0) { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil]; }#endif5.0后版本可以使用#prag... 阅读全文