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This article is about how to implement countdown timer in ios. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

The effect of this countdown timer is as follows:

After setting the time of UIDatePicker as the remaining time, click the start button to start timing. UIDatePicker modifies the remaining time every 60s.

The code is as follows:

@implementation JoyViewController

NSTimer* timer;

NSInteger leftSeconds;

- (void)viewDidLoad

{

[super viewDidLoad];

//Set to use Count Down Timer mode

self.countDonwn.datePickerMode = UIDatePickerModeCountDownTime;

}

-(IBAction)clicked:(id)sender

{

//Get remaining time of settings

leftSeconds = self.countDown.countDuration;

//disable UIDatePicker control

self.countDown.enabled = NO;

//disable start button

[sender setEnabled] = NO;

//initialize a string to be used as the contents of the warning box

NSString *message = [[NSString stringWithFormat:@"Start countdown? You have [ %d] seconds left ",leftSeconds];

//Create a UIAlertView

UIAlartView * alert = [[UIAlartView alloc]initWithTitle:@"Start countdown? "

message:message

delegate:nil

cancelButtonTitle:@"OK"

otherButtonTitles:nil];

[alert show];

//Enable timer to execute tickdown method every 60s

timer = [NSTimer scheduledTimerWithTimeInterVal:60

targer:self selector:@selector(tickDown)

userInfo:nil repeates:YES];

}

- (void) tickDown

{

//Reduce the remaining time by 60s

leftSeconds -= 60;

//modify the remaining time of UIDatePicker

self.countDown.countDownDuration = leftSeconds;

if(leftSeconds

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