Question

我是iOS的新手，我面临着将数据从网络服务显示到日历的问题。

我的代码就像这样

-(void)funAddEvents:(NSArray *)arrDate
{   
    _eventsByDate = [NSMutableDictionary new];


    for(int i=0;i<arrDate.count;i++)
    {

        NSString *datefromweb= [NSString stringWithFormat: @"%@",[[arrDate objectAtIndex:i] objectForKey:@"Date"]]; //Showing error on this like..
        NSDateFormatter* df = [[NSDateFormatter alloc] init];
        [df setDateFormat:@"MM/dd/yyyy hh:mm:ss a"];
        NSDate *randomDate = [[NSDate alloc] init];
        randomDate = [df dateFromString:datefromweb];

        NSString *key = [[self dateFormatter] stringFromDate:randomDate];
        //  NSLog(@"event date =%@",randomDate);

        if(!_eventsByDate[key])
        {
            _eventsByDate[key] = [NSMutableArray new];
        }

        [_eventsByDate[key] addObject:randomDate];
        // NSLog(@"afte event date %@",eventsByDate);
    }

}

提前致谢！

Answer 1

arrDate是String的数组，而不是Dictionary的数组，但由于错误的dateFormat，您的数字也为零。正确的字符串日期格式为yyyy/MM/dd，目前您将dateFormat设置为MM/dd/yyyy hh:mm:ss a这是错误的，因此更改dateFormat将解决您的问题。

for(int i=0;i<arrDate.count;i++)
{

    NSString *datefromweb= [NSString stringWithFormat: @"%@",[[arrDate objectAtIndex:i] objectForKey:@"Date"]]; //Showing error on this like..
    NSDateFormatter* df = [[NSDateFormatter alloc] init];
    [df setDateFormat:@"yyyy/MM/dd"];
    NSDate *randomDate = [[NSDate alloc] init];
    randomDate = [df dateFromString:datefromweb];

    NSString *key = [[self dateFormatter] stringFromDate:randomDate];
    //  NSLog(@"event date =%@",randomDate);

    if(!_eventsByDate[key])
    {
        _eventsByDate[key] = [NSMutableArray new];
    }

    [_eventsByDate[key] addObject:randomDate];
    // NSLog(@"afte event date %@",eventsByDate);
}

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