UIDatePicker setMinimumDate 和 setMaximumDate 设置为 null

发布于 2024-12-03 22:56:53 字数 364 浏览 0 评论 0原文

我不知道为什么这段极其基本的代码设置空值。

NSDate *currentTime = [NSDate date];
[datePicker setMinimumDate:currentTime];
[datePicker setMaximumDate:[currentTime dateByAddingTimeInterval:kSecondsInYear]];
NSLog(@"cur: %@, min: %@, max: %@",currentTime,datePicker.minimumDate,datePicker.maximumDate);

输出：当前：2011-09-09 16:18:18 GMT，最小值：（空），最大值：（空）

原文

I have no idea why this extremely basic piece of code sets null values.

NSDate *currentTime = [NSDate date];
[datePicker setMinimumDate:currentTime];
[datePicker setMaximumDate:[currentTime dateByAddingTimeInterval:kSecondsInYear]];
NSLog(@"cur: %@, min: %@, max: %@",currentTime,datePicker.minimumDate,datePicker.maximumDate);

Output: cur: 2011-09-09 16:18:18 GMT, min: (null), max: (null)

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九歌凝 2024-12-10 22:56:53

鉴于以下工作正常，问题肯定出在 datePicker 上。

UIDatePicker* datePicker = [[UIDatePicker alloc] init];
NSLog(@"DatePicker: %@", datePicker);
NSDate *currentTime = [NSDate date];
[datePicker setMinimumDate:currentTime];
[datePicker setMaximumDate:[currentTime dateByAddingTimeInterval:40000]];
NSLog(@"cur: %@, min: %@, max: %@",currentTime,datePicker.minimumDate,datePicker.maximumDate);

如果您将 NSLog(@"DatePicker: %@", datePicker); 添加到代码片段中，它应该报告类似于： DatePicker:>。如果它返回 (null) （我非常怀疑），那么它要么不是以编程方式创建的，要么没有连接到 Interface Builder 中。

Given that the following works fine, the issue is definitely with datePicker.

UIDatePicker* datePicker = [[UIDatePicker alloc] init];
NSLog(@"DatePicker: %@", datePicker);
NSDate *currentTime = [NSDate date];
[datePicker setMinimumDate:currentTime];
[datePicker setMaximumDate:[currentTime dateByAddingTimeInterval:40000]];
NSLog(@"cur: %@, min: %@, max: %@",currentTime,datePicker.minimumDate,datePicker.maximumDate);

If you add NSLog(@"DatePicker: %@", datePicker); to your code snippet it should report something a bit like: DatePicker: <UIDatePicker: 0x4b36740; frame = (0 0; 320 216); layer = <CALayer: 0x4b33940>>. If it returns (null) (which I very strongly suspect) then it's either not created programmatically or it's not hooked up in Interface Builder.

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