NSString类型的更改大小写

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NSString的定义变更情，基本上提供了三种方法的NSString类型的更改大小写

1。）lowercaseString：将改变成小写的字符串

2）uppercaseString：。字符串将改为大写

3。）capitalizedString：使用它，改变字符串的第一个字符的情况下帽

NSString *string1 = @"ROSE INDIA";

NSString *upperString = [[NSString alloc]initWithFormat:string1];

NSString* changeString = [upperStringlowercaseString];

NSLog(changeString);//rose india

//不考虑大小写比较字符串1

NSString *astring01 = @"this is a String!";

NSString *astring02 = @"This is a String!";

BOOLresult = [astring01 caseInsensitiveCompare:astring02] = =NSOrderedSame;

NSLog(@"result:%d",result);

//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)

//不考虑大小写比较字符串2

NSString *astring01 = @"this is a String!";

NSString *astring02 = @"This is a String!";

BOOLresult = [astring01 compare:astring02

options:NSCaseInsensitiveSearch |NSNumericSearch] = = NSOrderedSame;

NSLog(@"result:%d",result);

//NSCaseInsensitiveSearch:不区分大小写比较NSLiteralSearch:进行完全比较，区分大小写NSNumericSearch:比较字符串的字符个数，而不是字符值。