//每隔1s调用一次updateTimer方法
timer ＝[NSTimerscheduledTimerWithTimeInterval:1.0ftarget:selfselector:@selector(updateTimer:) userInfo:nilrepeats:YES];
／／实现如下的下拉效果
1.使用CABasicAnimation实现
CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"bounds.size.height"];
anim.duration = kDefaultAnimDuration;
anim.delegate = self;
anim.removedOnCompletion = NO;
anim.fromValue = [NSNumber numberWithFloat:0];
anim.toValue = [NSNumber numberWithFloat:_frameView.bounds.size.height];
[anim setValue:kValueAnimationDropDown forKey:kKeyAnimationID];
anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
anim.repeatCount = 0;
anim.autoreverses = NO;
anim.fillMode = kCAFillModeForwards;
[_frameView.layer addAnimation:anim forKey:@"DropIn"];
2.基本代码如下，在viewDidload里初始化view：
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- (void)viewDidLoad
{
[super viewDidLoad];
isShow = NO;
testView = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 100, 0)];
testView.backgroundColor = [UIColor grayColor];
testView.clipsToBounds = YES;
UIImageView *v = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 200)];
v.image = [UIImage imageNamed:@"320_480_1"];
[testView addSubview:v];
}
按钮触发的事件方法：
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-(IBAction)go:(id)sender
{
if(isShow)
{
[UIView animateWithDuration:0.3 animations:^void{
testView.frame = CGRectMake(0, 100, 100, 0);
}completion:^(BOOLfinished) {
[testView removeFromSuperview];
}];
}
else
{
[self.view addSubview:testView];
[UIView animateWithDuration:0.3 animations:^void{
testView.frame = CGRectMake(0, 100, 100, 200);
}completion:NULL];
}
isShow = !isShow;
}
