'updateTimer' 未申报（在一次使用此功能）

Question

我得到这个错误'updateTimer '未申报（在一次使用此功能）'

这是代码：

#import <UIKit/UIKit.h> 


@interface SleepAppFinalViewController : UIViewController 
{ 

    //IBOutlet UILabel *myLabel; 

    IBOutlet UILabel *_label; 
    NSTimer *timer; 

} 

-(void)updateTimer; 

.M

@implementation SleepAppFinalViewController 

-(void)updateTimer { 

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"hh:mm:ss"]; 
    _label.text = [formatter stringFromDate:[NSDate date]]; 
    [formatter release]; 
} 

- (void)viewDidLoad 
{ 
    timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:(updateTimer) userInfo:nil repeats:YES]; 
    [super viewDidLoad]; 


} 

该错误是在“定时器”的viewDidLoad中线

Answer 1

应当@selector(updateTimer)代替邻f (updateTimer)。

Answer 2

- (void)viewDidLoad 
{ 
    timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES]; 
    [super viewDidLoad]; 


}