NSString字符串的大写，小写，首字母大写转换

代码：html

NSString *str = @"Hello, world";
    NSLog(@"uppercaseString:%@", [str uppercaseString]);
    NSLog(@"lowercaseString:%@", [str lowercaseString]);
    NSLog(@"capitalizedString:%@", [str capitalizedString]);
    
    NSLog(@"****** ******");
    
    // 字母变换大小写时，中文字符被忽略，不会报错
    NSString *cnstr = @"Hello, 世界";
    NSLog(@"uppercaseString:%@", [cnstr uppercaseString]);
    NSLog(@"lowercaseString:%@", [cnstr lowercaseString]);
    NSLog(@"capitalizedString:%@", [cnstr capitalizedString]);

运行结果：api

2014-07-24 23:16:55.768 NSString[1991:71188] uppercaseString:HELLO, WORLD
2014-07-24 23:16:55.769 NSString[1991:71188] lowercaseString:hello, world
2014-07-24 23:16:55.769 NSString[1991:71188] capitalizedString:Hello, World
2014-07-24 23:16:55.769 NSString[1991:71188] ****** ******
2014-07-24 23:16:55.769 NSString[1991:71188] uppercaseString:HELLO, 世界
2014-07-24 23:16:55.769 NSString[1991:71188] lowercaseString:hello, 世界
2014-07-24 23:16:55.769 NSString[1991:71188] capitalizedString:Hello, 世界

参考资料：spa

http://blog.sina.com.cn/s/blog_8345c9c90100vj6w.html
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