NSString 到 NSDate 转换时程序崩溃

发布于 2024-10-01 19:10:38 字数 1004 浏览 7 评论 0原文

我有一个很好的小 for 循环，但我被困住了。恐怕我已经代码盲了，或者是对象盲了？我不知道...我的应用程序在标记为 --> 的行崩溃，我不明白为什么。

    for(int search = 2; search<10; search=search+2) {
    NSString *arrayTime = [searchArray objectAtIndex:search];
    arrayTime = [@" " stringByAppendingString:arrayTime];
    NSString *arrayDate = [currentDate stringByAppendingString: arrayTime];
    --> NSDate *compareTime = [wholeDateTimeFormat dateFromString: arrayDate];
    NSDate *searchCompareTime = [wholeDateTimeFormat dateFromString:searchTime];
    NSLog(@"Start: %@ --- search: %@", compareTime, searchCompareTime);
    float compareResult = [searchCompareTime timeIntervalSinceDate: compareTime];
    NSLog(@"compareReslut: %f", compareResult);     
}

一些解释：currentDate 的格式如下：@"yyyy-MM-dd"。 wholeDateTimeFormat 的格式如下：@"yyyy-MM-dd HH:mm"。

然后我需要将其转换为 NSDate 对象；这就是失败的地方，到目前为止我不知道为什么。我把这归咎于我生病了。 :) 我没有构建错误，但它仍然在我身上消失。为什么？ :DI 非常感谢我能得到的所有帮助。

原文

I have a nice little for-loop and I am stuck. I am afraid I've gone code blind, or is it object blind? I can't tell... My app crashes on the line marked --> and I can't see why.

    for(int search = 2; search<10; search=search+2) {
    NSString *arrayTime = [searchArray objectAtIndex:search];
    arrayTime = [@" " stringByAppendingString:arrayTime];
    NSString *arrayDate = [currentDate stringByAppendingString: arrayTime];
    --> NSDate *compareTime = [wholeDateTimeFormat dateFromString: arrayDate];
    NSDate *searchCompareTime = [wholeDateTimeFormat dateFromString:searchTime];
    NSLog(@"Start: %@ --- search: %@", compareTime, searchCompareTime);
    float compareResult = [searchCompareTime timeIntervalSinceDate: compareTime];
    NSLog(@"compareReslut: %f", compareResult);     
}

Some explanations: currentDate is formatted like this: @"yyyy-MM-dd".
And wholeDateTimeFormat is formatted like this: @"yyyy-MM-dd HH:mm".

Then I need to convert it to an NSDate object; this is where is fails, and I have no idea why as of now. I blame it on the fact that I am falling ill. :)
I have no build errors and still it dies on me. Why? :D I am grateful for all the help I can get.

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猫性小仙女 2024-10-08 19:10:38

只需使用 NSDateFormatter - 它会自动完成这一切！

（我本想尝试更具体 - 但你的代码让我有点困惑）。

无论如何 - 像这样：

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease]; 
[df setDateFormat:@"YYYY-MM-dd"]; 
NSDate* date = [df dateFromString:@"2010-11-02"];

NSLog(@"Converted date is %@",date);

Just use NSDateFormatter - it does all this automatically!

(I was going to try to be more specific - but your code has me a bit confused).

Anyway - something like:

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease]; 
[df setDateFormat:@"YYYY-MM-dd"]; 
NSDate* date = [df dateFromString:@"2010-11-02"];

NSLog(@"Converted date is %@",date);

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