iOS字符串比较（区分与不区分大小写比较）

// 1、比较字符串(搜索功能)（区分大小写）方法一：

NSArray *array = [[NSArrayalloc]initWithObjects:@"beijing",@"shanghai",@"guangzou",@"wuhan",nil];

NSString *string = @"Ang";

NSPredicate *pred = [NSPredicatepredicateWithFormat:@"SELF CONTAINS %@",string];

NSLog(@"%@",[arrayfilteredArrayUsingPredicate:pred]);

// 2、比较字符串(搜索功能)（区分大小写）方法二：

if([arrayString rangeOfString:scanerString].location !=NSNotFound)

{

[StringArray addObject:arrayString];

}

// 3、比较字符串(搜索功能)（不区分大小写，谓词搜索）方法三：

NSArray *array = [[NSArrayalloc]initWithObjects:@"beijing",@"shanghai",@"guangzou",@"wuhan", nil];

NSString *string = @"HA";

// 谓词搜索

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self contains [cd] %@",string];

NSArray *arrays = [[NSArray alloc] initWithArray:[arrayfilteredArrayUsingPredicate:predicate]];

NSLog(@"=-- %@",arrays);

// 4、比较字符串（不区分大小写）方法一：

NSString *string = @"hello world!";

NSString *string2 = @"Hello World";

BOOL result = [string caseInsensitiveCompare:string2] == 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)

// 5、比较字符串（不区分大小写）方法二：

NSString *string3 = @"you are my";

NSString *string4 = @"you Are my";

BOOL result2 = [string3 compare:string4

options:NSCaseInsensitiveSearch |NSNumericSearch] ==NSOrderedSame;

NSLog(@"result:%d",result2);

//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。

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