NSString

• string.uppercaseString，转换成大写

 

• NSLog(@"%@",NSStringFromCGRect(self.view.frame));// NSStringFromCGRect，将CGRect转成字符串

 

犯了一个严重的错误：    //1.2 删除拓展名

    NSString *imgName = [self stringByDeletingPathExtension];我写成了NSString *imgName = [self stringByDeletingLastPathComponent];// 结果是返回一个空的字符串 (an empty string)

 

• 打印CGRect

 

NSLog(@"%@", NSStringFromCGRect(mySerachview.frame));