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我想通过UIPageControl从左到右动画UIImageView。我有这个代码,但它似乎有点奇怪...特别是因为当我到达图像3时我会做什么?我会回来,那会陷入困境的的PageControl阵列中的意见,数学计算,我有它设置方式:如何使用UIPageControl从左到右设置UIImageView的动画效果?
-(void)createUIViews{
UIImage *image1 = [UIImage imageNamed:@"GiftCard.png"];
firstView = [[UIImageView alloc] initWithImage:image1];
firstView.backgroundColor = [UIColor grayColor];
firstView.tag = 1;
firstView.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);
[self.view addSubview:firstView];
CGRect newFrame = firstView.frame;
newFrame.origin.x += 40; // shift right by 50pts
newFrame.origin.y += 40;
[UIView animateWithDuration:1.0
animations:^{
firstView.frame = newFrame;
}];
UIImage *image2 = [UIImage imageNamed:@"MyCard.png"];
secondView = [[UIImageView alloc] initWithImage:image2];
secondView.backgroundColor = [UIColor grayColor];
secondView.tag = 1;
secondView.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);
UIImage *image3 = [UIImage imageNamed:@"GiftCard.png"];
thirdView = [[UIImageView alloc] initWithImage:image3];
thirdView.backgroundColor = [UIColor grayColor];
thirdView.tag = 1;
thirdView.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self createUIViews];
// Set up the views array with 3 UIImageViews
views = [[NSArray alloc] initWithObjects:firstView, secondView, thirdView, nil];
// Set pageControl's numberOfPages to 3
self.pageControl.numberOfPages = [views count];
// Set pageControl's currentPage to 0
self.pageControl.currentPage = 0;
// Call changePage each time value of pageControl changes
[self.pageControl addTarget:self action:@selector(changePage:) forControlEvents:UIControlEventValueChanged];
}
- (IBAction) changePage:(id)sender {
NSLog(@"pageControl position %d", [self.pageControl currentPage]);
int oldPageControlPosition = [self.pageControl currentPage] - 1;
NSLog(@"old pageControl position %d", oldPageControlPosition);
//0 Get the currentview as referenced by pageControl
UIImageView *oldView = [views objectAtIndex:oldPageControlPosition];
//NSLog(@"views objectAtIndex = %@",[views objectAtIndex:[self.pageControl currentPage]]);
//1 Animate out the old view
CGRect oldViewFrame = oldView.frame;
oldViewFrame.origin.x -= 300;
[UIView animateWithDuration:2.0
delay: 0.5
options: UIViewAnimationOptionCurveEaseIn
animations:^{
oldView.frame = oldViewFrame;
}
completion:nil];
//3 Get next view from array
UIImageView *nextView = [views objectAtIndex:[self.pageControl currentPage]];
//4 Add it to mainview
[self.view addSubview:nextView];
//5 Animate in
CGRect nextViewFrame = nextView.frame;
nextViewFrame.origin.x += 40; // shift right by 50pts
nextViewFrame.origin.y += 40;
[UIView animateWithDuration:1.0
animations:^{
nextView.frame = nextViewFrame;
}];
}
当我到达终点,我尝试返回,最后位置2和oldPosition当时是1.哪个是正确的,数组从0到1到2共3个位置。但是当我回来时,日志显示位置为1而不是2,这很好,因为我颠倒了...但是旧位置显示0而不是2.