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 = [[NSArray
alloc]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:[array
filteredArrayUsingPredicate: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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