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我想通過UIPageControl從左到右動畫UIImageView。我有這個代碼,但它似乎有點奇怪...特別是因爲當我到達圖像3時我會做什麼?我會回來,那會陷入困境的的PageControl陣列中的意見,數學計算,我有它設置方式:如何使用UIPageControl從左到右設置UIImageView的動畫效果?
-(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;
}];
}
當我到達終點,我嘗試返回,最後位置2和oldPosition當時是1.哪個是正確的,數組從0到1到2共3個位置。但是當我回來時,日誌顯示位置爲1而不是2,這很好,因爲我顛倒了...但是舊位置顯示0而不是2.