[Code Note] UILable workbook display, note uilable workbook

[Code Note] UILable workbook display, note uilable workbook

I ,.

Ii. Code.

RootViewController. h

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController{    UILabel *label;    NSDateFormatter  *dateFormatter ;}@end

 

RootViewController. m

# Import "RootViewController. h "@ interface RootViewController () @ end @ implementation RootViewController-(id) initWithNibName :( NSString *) bundle :( NSBundle *) handle {self = [super initWithNibName: nibNameOrNil bundle: nibBundleOrNil]; if (self) {// Custom initialization} return self;}-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. // label = [[UILabel alloc] initWithFrame: CGRectMake (50,100,200,200)]; label. backgroundColor = [UIColor redColor]; [self. view addSubview: label]; // timer [NSTimer scheduledTimerWithTimeInterval: 1.0f target: self selector: @ selector (updateTime) userInfo: nil repeats: YES]; dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat: @ "HH: mm: ss"] ;}- (void) updateTime {label. text = [dateFormatter stringFromDate: [NSDate date];}