嘿伙计们另一个问题！
再次声明，我是新手，因此我理解语言 Objective C 和 Xcode 应用程序的能力有限！因此，非常感谢您的帮助！
我构建了一个倒计时应用程序，它显示广播电台何时上线，倒计时工作完美并每秒实时更新一次，然后我将其插入到“If-Statement”中，以便在电台启动当天到达倒计时消失了，但现在我的倒计时没有实时更新，它只是静止不动。
以下是我的代码：
- (void)viewDidAppear:(BOOL)animated {
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
NSString *launchDay = [[NSString alloc] initWithString:@"11/26/2010 11:59:59"];
NSDate *currentDate = [dateformatter dateFromString:launchDay];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
int unitFlags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *components = [gregorian components:unitFlags fromDate:today toDate:currentDate options:0];
if ([today timeIntervalSinceDate:currentDate] <= 0 ){
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
countdownLabel.text = [NSString stringWithFormat:@"%02d:%02d:%02d:%02d", components.day, components.hour, components.minute, components.second ];
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateLabel) userInfo:nil repeats:YES];
[self updateLabel];
days.text = @"Days";
hours.text = @"Hours";
mins.text = @"Mins";
secs.text = @"Secs";
until.text = @"Until XtremeFM Launch!";
}
else {
countdownLabel.text =@"XtremeFM is LIVE";
}
}
伙计们，非常感谢任何帮助，我真的希望有人可以帮助我！
谢谢大家，菲尔
好的，这是主屏幕的整个 .M 文件的代码
#import "XtremeFMViewController.h"
@implementation XtremeFMViewController
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
@synthesize countdownLabel, today, timer, todayDate, days, hours, mins, secs, until;
-(void)updateLabel {
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
//NSString *launchDay = [[NSString alloc] initWithString:@"11/26/2010 11:59:59"];
//NSDate *currentDate = [dateformatter dateFromString:launchDay];
//NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
//int unitFlags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
//NSDateComponents *components = [gregorian components:unitFlags fromDate:today toDate:currentDate options:0];
}
- (void)viewDidAppear:(BOOL)animated {
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
NSString *fathersDay = [[NSString alloc] initWithString:@"11/26/2010 11:59:59"];
NSDate *currentDate = [dateformatter dateFromString:fathersDay];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
int unitFlags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *components = [gregorian components:unitFlags fromDate:today toDate:currentDate options:0];
if ([today timeIntervalSinceDate:currentDate] <= 0 ){
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
countdownLabel.text = [NSString stringWithFormat:@"%02d:%02d:%02d:%02d", components.day, components.hour, components.minute, components.second ];
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateLabel) userInfo:nil repeats:YES];
[self updateLabel];
days.text = @"Days";
hours.text = @"Hours";
mins.text = @"Mins";
secs.text = @"Secs";
until.text = @"Until XtremeFM Launch!";
}
else {
countdownLabel.text =@"XtremeFM is LIVE";
}
}
- (IBAction)watchLive {
self.today = [NSDate date];
NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM/dd/yyyy hh:mm:ss"];
NSString *launchDay = [[NSString alloc] initWithString:@"11/26/2010 11:59:00"];
NSDate *currentDate = [dateformatter dateFromString:launchDay];
//NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
//int unitFlags = NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
//NSDateComponents *components = [gregorian components:unitFlags fromDate:today toDate:currentDate options:0];
//countdownLabel.text = [NSString stringWithFormat:@"%02d:%02d:%02d:%02d", components.day, components.hour, components.minute, components.second ];
if ([today timeIntervalSinceDate:currentDate] >= 0 ){
NSString *webpage = @"http://xphiltestpagex.is.livestream-api.com/livestreamiphone/philtestpage/playlist.m3u8";
NSURL *nswebpage = [NSURL URLWithString:webpage];
NSURLRequest *nsurl = [NSURLRequest requestWithURL:nswebpage];
[webView loadRequest:nsurl];
}
else {
UIAlertView*alert = [[UIAlertView alloc] initWithTitle:@"Coming Soon" message:@"Feed goes live Friday 26th November 12:00pm" delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
-(IBAction)requestsPage {
RequestsPageViewController *move = [[RequestsPageViewController alloc]initWithNibName:nil bundle:nil];
move.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:move animated:YES];
[move release];
}
-(IBAction)twitterButton {
RequestsPageViewController *move = [[RequestsPageViewController alloc]initWithNibName:nil bundle:nil];
move.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:move animated:YES];
[move release];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
看到我有一个（BOOL）动画，ViewDidAppear但我不知道如何将它添加到 if 语句（Noob）