Question

如何在标签iphone上显示当前时间？

Answer 1

<强>目标C

NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd.MM.YY HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:currDate];

yourLabel.text=dateString

Swift 3.0

var currDate = Date()
var dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd.MM.YY HH:mm:ss"
var dateString = dateFormatter.string(fromDate: currDate)
yourLabel.text! = dateString

Answer 2

确定。这就是你需要的东西。

将IBOutlet标签放在视图控制器的.h文件中。连接.xib文件。

现在，只需将以下代码放在视图控制器的.m文件中即可。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // your label text is set to current time
    lblTime.text=[[NSDate date] description];
    // timer is set & will be triggered each second 
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showTime) userInfo:nil repeats:YES];

}
// following method will be called frequently.
-(void)showTime{
    lblTime.text=[[NSDate date] description];
}

Answer 3

使用NSTimer触发对更新标签的方法的常规调用。

Answer 4

如果您必须在显示之前格式化日期，请使用NSDateFormatter类。

http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/Reference/Reference.html

如何在标签上显示当前时间？

4 个答案: