我如何在标签上显示当前时间？

Question

我该如何显示标签iPhone上的当前时间？

Answer 1

好的。这是你需要的东西。

在您的视图控制器的.h文件上放置一个IBOutlet Label &以.xib文件连接。

现在，只需将以下代码放置在视图控制器的.m文件中。

- (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 2

使用NSTimer触发对更新标签的方法的定期调用。

Answer 3

如果在显示之前必须格式化日期，请使用NSDateFormatter类。

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

Answer 4

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 

夫特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