ios/iphone NSString的截取与大小写改变

NSString *str0 = @"中文my name is xyxd";

 

//截取字符串起始点到index为4之间的内容

NSString * to = [str0 substringToIndex:4];

 

NSLog(@"to = %@",to);

 

//截取字符index为2 到结尾之间的内容

NSString * from = [str0 substringFromIndex:2];

 

NSLog(@"from = %@",from);

 

 

//设置截取字符串的范围 

//从第二位到第十位

NSRange rang = NSMakeRange(2, 10);

NSString * strRang = [str0 substringWithRange:rang];

NSLog(@"rang = %@",strRang);

 

//设置字符串首字母大写

NSLog(@"str0首字母大写:%@",[str0 capitalizedString]);

//设置字符串全部内容为大写

NSLog(@"str0大写:%@",[str0 uppercaseString]);

//设置字符全部内容为小写

NSLog(@"str0小写:%@",[str0 lowercaseString]);