字符串、快速枚举

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//字符串连接

str3 = [str1 stringByAppendingString:str2];

//转为大写

[str1 uppercaseString];

//转为小写

[str1 lowercaseString];

//substringToIndex创建一个子字符串

NSString * str = @"thank for you";

str3 = [str substringToIndex:5];

显示为:thank

//substringFromIndex返回一个字符串

[str substribgFromIndex:5];

 

for(NSString * str in dict)

{

　　NSLog(@"%@:%@",str,[dict objectForkey : str]);

}

 

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