我的应用程序中有多个选项卡。我的一个视图控制器正在运行动画,
当我切换到另一个视图控制器,并再次进入带有动画的视图控制器时,动画停止,
有人可以指导我使用 Xcode 甚至在 Iphone 应用程序中切换选项卡吗?
- (IBAction)btn:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *soundStatus = [defaults objectForKey:@"Sound_Swich"];
//NSLog(@"soundstatus is %@ ", soundStatus);
if([soundStatus isEqual:@"YES"])
{
[self soundEffect];
}
if ([btnpress isEqualToString:@"start"]) {
btnpress= @"pause";
int radius = 100;
circle = [CAShapeLayer layer];
circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius)
cornerRadius:radius].CGPath;
circle.fillColor = [UIColor clearColor].CGColor;
circle.strokeColor = [UIColor greenColor].CGColor;
circle.lineWidth = 5;
[imgview.layer addSublayer:circle];
// Configure animation
drawAnimation= [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
drawAnimation.duration = 5.0; // "animate over 10 seconds or so.."
drawAnimation.repeatCount = 8.0; // Animate only once..
// Animate from no part of the stroke being drawn to the entire stroke being drawn
drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
drawAnimation.toValue = [NSNumber numberWithFloat:1.0f];
// Experiment with timing to get the appearence to look the way you want
drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
// Add the animation to the circle
[circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
timerWasStarted=YES;
//totalSeconds = 120;
totalSeconds = 10;
twoMinTimer = [NSTimer scheduledTimerWithTimeInterval:1.0f
target:self
selector:@selector(timer)
userInfo:nil
repeats:YES];
// NSLog(@"start %@",[NSDate date]);
}// to pause animation and timer
else if ([btnpress isEqualToString:@"pause"]){
flag=1;
btnpress=@"resume";
pauseStart = [NSDate dateWithTimeIntervalSinceNow:0];
previousFireDate = [twoMinTimer fireDate];
[twoMinTimer setFireDate:[NSDate distantFuture]];
// NSLog(@"pause %@",[NSDate date]);
[self pauseLayer:circle];
}// to resume animation and timer
else if([btnpress isEqual:@"resume"]&&flag==1){
btnpress= @"pause";
float pauseTime = -1*[pauseStart timeIntervalSinceNow];
[twoMinTimer setFireDate:[NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate]];
[self resumeLayer:circle];
}
- (void)pauseLayer:(CALayer *)layer
{
pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
//NSLog(@"pauseoffset %f",pausedTime);
}
- (void)resumeLayer:(CALayer *)layer
{
// NSLog(@"resume %@",[NSDate date]);
CFTimeInterval pausedTime1 = [layer timeOffset];
layer.speed = 1.0;
layer.timeOffset = 0.0;
layer.beginTime = 0.0;
timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime1;
layer.beginTime = timeSincePause;
//NSLog(@"resume offset %f",[layer timeOffset]);
}
我需要的答案是
drawAnimation.removedOnCompletion=NO;
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