Question

我想让它变得更短或占用更少的空间。

 totalTime = [self timeFormatted:([currentFeed duration].intValue)-1];
    NSString *word = @":00:";
    if ([totalTime rangeOfString:word].location == NSNotFound) {
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"00:" withString:@""];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"01:" withString:@"1:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"02:" withString:@"2:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"03:" withString:@"3:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"04:" withString:@"4:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"05:" withString:@"5:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"06:" withString:@"6:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"07:" withString:@"7:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"08:" withString:@"8:"];
        totalTime = [totalTime stringByReplacingOccurrencesOfString:@"09:" withString:@"9:"];
    }

非常感谢任何帮助。

Answer 1

您可以将totalTime设为mutableString。然后，您可以将映射放入NSDictionary并迭代它。

NSMutableString *ms = [[totalTime mutableCopy] autorelease];

NSDictionary *d = @{@"00":@"", @"01:":@"1:", @"02:":@"2:" /* ... */};

[d enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
    [ms replaceOccurrencesOfString:key withString:obj options:NSCaseInsensitiveSearch range:NSMakeRange(0, [ms length])];
}];

totalTime = ms;

顺便说一句，如果您要设置日期格式，请查看NSDateFormatter reference。

Answer 2

采用与正则表达式不同的方法：

NSError *error = NULL;
// replace 0X: with X: where X is 1-9
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"0([1-9]:)" options:0 error:&error];
date = [regex stringByReplacingMatchesInString:date options:0 range:NSMakeRange(0,date.length) withTemplate:@"$1"];

// remove 00: if not preceded by :
regex = [NSRegularExpression regularExpressionWithPattern:@"(?<!:)00:" options:0 error:&error];
date = [regex stringByReplacingMatchesInString:date options:0 range:NSMakeRange(0,date.length) withTemplate:@""];

Answer 3

为NSString添加一个类别：

@implementation NSString (replace)

-(void) replace:(NSString*)old with:(NSString*)new{

self = [self stringByReplacingOccurrencesOfString:old  withString:new];
}

所以你只需要打电话： [totalTime replace:@"00:" with:@""];

在数组中创建一个方法？还是更短？

3 个答案: