iOS针对字符串的一系列操作

1.删除字符串的最后一位

self.invites = [self.invitessubstringToIndex:[self.inviteslength] -1];

2.判断字符串中是否含有空格

+ (BOOL)isHaveSpaceInString:(NSString *)string{
    NSRange _range = [string rangeOfString:@" "];
    if (_range.location != NSNotFound) {
        return YES;
    }else {
        return NO;
    }
}

3.判断字符串中是否含有中文

+ (BOOL)isHaveChineseInString:(NSString *)string
{
    for(NSInteger i = 0; i < [string length]; i++){
        int a = [string characterAtIndex:i];
        if (a > 0x4e00 && a < 0x9fff) {
            return YES;
        }
    }
    return NO;
}

4.判断字符串是否全部为数字

+ (BOOL)isAllNum:(NSString *)string{
    unichar c;
    for (int i=0; i
c="[string characterAtIndex:i];"
if (!isdigit(c)) {=""
return no;=""         }=""     }=""
return yes;=""
}
判断是否是纯数字
+ (BOOL)isPureInteger:(NSString *)str {
    NSScanner *scanner = [NSScanner scannerWithString:str];
    NSInteger val;
    return [scanner scanInteger:&val] && [scanner isAtEnd];
}

5.过滤一些特殊字符 似乎只能去除头尾的特殊字符(不准)

+ (NSString *)filterSpecialWithString:(NSString *)string
{
    // 定义一个特殊字符的集合
    NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:
                   @"@／：；: ;（）?「」＂、[]{}#%-*+=_|~＜＞$?^?'@#$%^&*()_+'"];
    // 过滤字符串的特殊字符
    NSString *newString = [string stringByTrimmingCharactersInSet:set];
    return newString;
}

6.字符串内包含引号

 NSString * testStr = @"你好，\"你好\"";
 NSLog(@"%@",testStr);

//输出结果为：你好，"你好"

7.iOS 字符串的操作，去掉某一个字符或者替换成其他字符

NSString *strUrl = [urlString stringByReplacingOccurrencesOfString:@" " withString:@""];  去掉空格

NSString *strUrl = [urlString stringByReplacingOccurrencesOfString:@" " withString:@"/"];替换字符