出于用户体验大多数应用在应用首次启动时，显示一个简单的介绍页面也就是用户引导页面,如下效果：
自己也试着尝试了一下，主要是使用scrollview实现视图的切换，当切换到最后一张时会出现一个开始按钮，点击开始按钮关闭引导。
开始按钮点击处理：
[cpp]
- (IBAction)startButtonDidPressed:(id)sender{
[self.startButton setHidden:YES];
NSArray *array = [UIImage splitImageIntoTwoParts:self.imageView.image];
self.left = [[UIImageView alloc] initWithImage:[array objectAtIndex:0]];
float height = DEVICE_IS_IPHONE5 ? 568 : 480;
[self.left setFrame:CGRectMake(0, 0, 320, height)];
self.right = [[UIImageView alloc] initWithImage:[array objectAtIndex:1]];
[self.right setFrame:CGRectMake(0, 0, 320, height)];
[self addSubview:self.left];
[self addSubview:self.right];
[self.pageScroll setHidden:YES];
[self.pageControl setHidden:YES];
self.left.transform = CGAffineTransformIdentity;
self.right.transform = CGAffineTransformIdentity;
[UIView beginAnimations:@"split" context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:1.2];
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
[self.left setAlpha:0.15];
[self.right setAlpha:0.15];
self.left.transform = CGAffineTransformMakeTranslation(-180 ,0);
self.right.transform = CGAffineTransformMakeTranslation(180 ,0);
[UIView commitAnimations];
}
- (IBAction)startButtonDidPressed:(id)sender{
[self.startButton setHidden:YES];
NSArray *array = [UIImage splitImageIntoTwoParts:self.imageView.image];
self.left = [[UIImageView alloc] initWithImage:[array objectAtIndex:0]];
float height = DEVICE_IS_IPHONE5 ? 568 : 480;
[self.left setFrame:CGRectMake(0, 0, 320, height)];
self.right = [[UIImageView alloc] initWithImage:[array objectAtIndex:1]];
[self.right setFrame:CGRectMake(0, 0, 320, height)];
[self addSubview:self.left];
[self addSubview:self.right];
[self.pageScroll setHidden:YES];
[self.pageControl setHidden:YES];
self.left.transform = CGAffineTransformIdentity;
self.right.transform = CGAffineTransformIdentity;
[UIView beginAnimations:@"split" context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:1.2];
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
[self.left setAlpha:0.15];
[self.right setAlpha:0.15];
self.left.transform = CGAffineTransformMakeTranslation(-180 ,0);
self.right.transform = CGAffineTransformMakeTranslation(180 ,0);
[UIView commitAnimations];
}
将最后一张图片切割成两部分，添加一个“开门的动画”，动画结束时移除图片：
[cpp]
-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
if ([animationID isEqualToString:@"split"] && finished) {
[self.left removeFromSuperview];
[self.right removeFromSuperview];
}
[self removeFromSuperview];
}
-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
if ([animationID isEqualToString:@"split"] && finished) {
[self.left removeFromSuperview];
[self.right removeFromSuperview];
}
[self removeFromSuperview];
}
说明：splitImageIntoTwoParts （Terry Lin 实现）是实现了UIImage的分类，将图片分割成两部分。
