【发布时间】：2010-07-14 11:57:27
【问题描述】：
我有一个包含分段控制器和只显示 24 小时时间的 UIDatePicker 的视图。我希望能够根据分段控件的内容设置不同的时间。所以“Mon”对应一个时间，“Tue”对应另一个时间，以此类推。我有这个工作。但是，当用户更改分段控制器上的按钮时，我还想为选择器设置动画。截至目前，我的操作方法中已链接到分段控制器：
[timePicker setDate:date animate:YES];
其中 date 是一个 NSDate，格式如下：HH:mm
正如我所说，它将更改为日期，但不会为操作设置动画。有谁知道为什么它没有动画？
顺便说一句，虽然我已将格式化程序设置为“HH:mm”，但如果我使用 NSLog 打印它，我仍然会打印整个 1970-01-01 +02:00:00 字符串。我假设唯一的 HH:mm 无论如何都会发送到日期选择器，并且它只是打印整个内容的 NSLog？
编辑：这是实际视图控制器的代码，它正在运行 SDK4
#import "FlipsideViewController.h"
@implementation FlipsideViewController
@synthesize delegate, times, weatherImage, condition, timePicker;
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];
UIImage *image = [UIImage imageNamed:@"sunny.png"];
weatherImage.image = image;
WeatherClockAppDelegate *appDelegate = (WeatherClockAppDelegate *)[[UIApplication sharedApplication] delegate];
times = appDelegate.times;
[timePicker addTarget:self action:@selector(timePickerAction:) forControlEvents:UIControlEventValueChanged];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"HH:mm"];
NSDate *sunnyDate = [df dateFromString: [times objectAtIndex:0]];
[df release];
[timePicker setDate:sunnyDate animated:NO];
}
- (IBAction)done:(id)sender {
if (!busy) {
[self.parentViewController dismissModalViewControllerAnimated:YES];
for (NSString *s in times) {
NSLog(@"Set times: %@", s);
}
}
}
- (IBAction)segmentedAction {
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"HH:mm"];
switch (self.condition.selectedSegmentIndex) {
case 0:
self.weatherImage.image = [UIImage imageNamed:@"sunny.png"];
NSDate *sunnyDate = [df dateFromString: [times objectAtIndex:0]];
[timePicker setDate:sunnyDate animated:YES];
break;
case 1:
self.weatherImage.image = [UIImage imageNamed:@"cloudy.png"];
NSDate *cloudyDate = [df dateFromString: [times objectAtIndex:1]];
NSLog(@"Cloudydate: %@", cloudyDate);
[timePicker setDate:cloudyDate animated:YES];
break;
case 2:
self.weatherImage.image = [UIImage imageNamed:@"rain.png"];
NSDate *rainyDate = [df dateFromString: [times objectAtIndex:2]];
[timePicker setDate:rainyDate animated:YES];
break;
case 3:
self.weatherImage.image = [UIImage imageNamed:@"final.png"];
NSDate *finalDate = [df dateFromString: [times objectAtIndex:3]];
[timePicker setDate:finalDate animated:YES];
break;
}
[df release];
}
- (IBAction)timePickerAction:(id)sender {
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"HH:mm"];
NSString *date = [NSString stringWithFormat:@"%@", [df stringFromDate:timePicker.date]];
NSLog(@"%@", date);
[df release];
switch (self.condition.selectedSegmentIndex) {
case 0:
[times replaceObjectAtIndex:0 withObject:date];
break;
case 1:
[times replaceObjectAtIndex:1 withObject:date];
break;
case 2:
[times replaceObjectAtIndex:2 withObject:date];
break;
case 3:
[times replaceObjectAtIndex:3 withObject:date];
break;
}
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)dealloc {
[times release];
[weatherImage release];
[condition release];
[timePicker release];
[super dealloc];
}
@end
【问题讨论】：
-
你能发布更多代码吗（尤其是你如何创建 NSDate 实例）？因为您发布的单行代码看起来不错（除了正确的方法是
setDate:animated:，而不是setDate:animate:，我假设这是一个错字）。 -
您的“日期是 NSDate 格式如下：HH:mm”没有任何意义。 NSDate 总是代表一个特定的时间点，包括日期和时间直到 microsendend。
NSDate对象本身根本没有固有的格式。
标签： iphone animation ios4 nsdate uidatepicker