我试图在菜单中上下移动UIButton。 我用以下解决方案得到的问题是计时器不准确。有时按钮向上移动122px,有时仅为120px。我怎么解决这个问题?
-(IBAction)marketTabClicked:(id)sender {
if (marketTabExtended) {
NSLog(@"marketTabExtended = YES");
return;
}
else {
if (iPhoneAppsExtended) {
timer = [NSTimer scheduledTimerWithTimeInterval:0.005 target: self selector: @selector(animateItemApps) userInfo: nil repeats: YES];
}
else {
if (homepageExtended) {
timer = [NSTimer scheduledTimerWithTimeInterval:0.005 target: self selector: @selector(animateItemHomepage) userInfo: nil repeats: YES];
}
else {
timer = [NSTimer scheduledTimerWithTimeInterval:0.005 target: self selector: @selector(animateItemMarketing) userInfo: nil repeats: YES];
}
}
}
[self performSelector:@selector(stopTimer) withObject:self afterDelay:0.605];
iPhoneAppsExtended = NO;
homepageExtended = NO;
marketTabExtended = NO;
marketTabExtended = YES;
}
-(void)animateItemApps {
CGPoint movement;
movement = CGPointMake(0, -1);
homepage.center = CGPointMake(homepage.center.x, homepage.center.y + movement.y);
}
-(void)animateItemHomepage {
CGPoint movement;
movement = CGPointMake(0, 1);
homepage.center = CGPointMake(homepage.center.x, homepage.center.y + movement.y);
//marketTab.center = CGPointMake(marketTab.center.x, marketTab.center.y + movement.y);
}
-(void)animateItemMarketing {
CGPoint movement;
movement = CGPointMake(0, -1);
//marketTab.center = CGPointMake(marketTab.center.x, marketTab.center.y + movement.y);
homepage.center = CGPointMake(homepage.center.x, homepage.center.y + movement.y);
}
-(void)stopTimer {
[timer invalidate];
}
答案 0 :(得分:1)
为什么不使用UIView动画块?
[UIView beginAnimations:nil context:nil];
//Change UIButton frame here
[UIView commitAnimations];
动画块(评论所在的位置)所做的更改将在commitAnimations
后生成动画。
检查类mathods以获取更多选项:http://tinyurl.com/34y8j5o