帮大家总结OC中的常用NSString方法 - 黑马程序员技术交流社区

NSString *str1 = @"BeiJing";
NSString *str2 = @"beijing";
//全部转为大写
NSLog(@"%@",[str1 uppercaseString]);
//全部转为小写
NSLog(@"%@",[str1 lowercaseString]);
//首字母大写
NSLog(@"%@",[str1 capitalizedString]);
//比较两个字符串内容是否相同
BOOL b =[str1 isEqualToString:str2];
//两个字符串内容比较
//NSOrderedAscending 右边 > 左边
//NSOrderedSame 内容相同
//NSOrderedDescending 左边 > 右边
NSComparisonResult result = [str1 compare:str2];
if (result == NSOrderedAscending) {
NSLog(@"右边 > 左边");
}else if(result == NSOrderedSame){
NSLog(@"内容相同");
}else if (result == NSOrderedDescending){
NSLog(@"左边 > 右边");
}
//忽略大小写进行比较，返回值与compare一样
result = [str1 caseInsensitiveCompare:str2];
if (result == NSOrderedAscending) {
NSLog(@"右边 > 左边");
}else if(result == NSOrderedSame){
NSLog(@"内容相同");
}else if (result == NSOrderedDescending){
NSLog(@"左边 > 右边");
}
//判断字符串是否以指定字符串开头
[str1 hasPrefix:@"aaa"];
//判断字符串是否以指定字符串结尾
[str1 hasSuffix:@"aaa"];
//判断字符串是否包含指定字符串，返回位置和长度
NSRange range = [@"123456" rangeOfString:@"456"];
NSLog(@"%@", NSStringFromRange(range));
//反向搜索
range = [@"123456456qweasasd456" rangeOfString:@"456" options:NSBackwardsSearch];
NSLog(@"%@",NSStringFromRange(range));
//指定范围进行搜索
range = NSMakeRange(0, 9);
range = [@"123456456qweasasd456" rangeOfString:@"456" options:NSBackwardsSearch range:range];
NSLog(@"%@",NSStringFromRange(range));

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