Question

我正在尝试实施日历。我有一个年份标签和两个按钮，用于递增和递减日历年份。我得到这个异常（Thread1：EXC_BAD_ACCESS（代码= 1，地址= 0x5146a345）），而点击按钮（增加或减少）我的要求是，如果我点击右键我的年份应该增加，如果我点击左按钮我的一年应该减少。我的例外行date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];可以帮助您解决此问题。这是我的代码

   - (void)viewDidLoad
    {
        [super viewDidLoad];

        date = [NSDate date];
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"YYYY"];
        NSString *stringFromDate = [formatter stringFromDate:date];
        yar1.text=stringFromDate;

     }
    - (IBAction)right:(id)sender {

        NSCalendar *cal = [NSCalendar currentCalendar];

        date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"YYYY"];
        NSString *stringFromDate = [formatter stringFromDate:date];
        yar1.text=stringFromDate;

       }
 - (IBAction)left:(id)sender {

        NSCalendar *cal = [NSCalendar currentCalendar];

        date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"YYYY"];
        NSString *stringFromDate = [formatter stringFromDate:date];
        yar1.text=stringFromDate;

       }

Answer 1

您需要一个日期组件来更改日期，

-(NSDate *)offsetYear:(int)numOfYears date:(NSDate*)date 
{
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setYear:numOfYears];

return [[NSCalendar currentCalendar] dateByAddingComponents:offsetComponents
                              toDate:date options:0]; }

将偏移量传递为1表示右侧，-1表示左侧

Thread1：EXC_BAD_ACCESS（代码= 1，地址= 0x5146a345）

1 个答案: