iOS开发学习随记

//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;

}