项目中有时候需要引导页,本人是用scrollview自己写的一个非常简单地实现,下文中的UIBarButtonItem *right 这个导航条上得右侧按钮就是触发引导页的,(我的程序开始要求第一次运行的时候要有引导屏,然后在程序的其他地方还能查看引导屏,下文中我没有写程序第一次启动的时候引导屏的过程,那个其实也不难,有需要的可以自己判断程序是不是第一次启动后,添加一个viewcontroller也行或者直接在appdelegate中实现,关键是你判断程序第一次运行)
下文中的bu是一个在导航页最后一页上得一个按钮,用于点击后回到主页面的操作,引导页效果有很多种,这里为大家带来最简单的一种。
前提要设置好uiscrollview的代理,
- (void)viewdidload
{
//右边的问号 引导页显示按钮
UIBarButtonItem *right = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"引导屏"] style:(UIBarButtonItemStyleBordered) target:self action:@selector(guidView)];
self.navigationItem.rightBarButtonItem = right;
_backView = [[UIView alloc]initWithFrame:CGRectMake(320, 0, 320, 480)];
_backView.backgroundColor = [UIColor grayColor];
_scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, self.view.bounds.size.height)];
[_backView addSubview:_scrollView];
_scrollView.contentSize = CGSizeMake(320*7, self.view. bounds.size.height);
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.pagingEnabled=YES;//是否自己动适应
_scrollView.delegate = self;
_pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(60, 455, 200, 20)];
_pageControl.numberOfPages = 7;
_pageControl.currentPage = 0;
[_pageControl setBounds:CGRectMake(0,0,16*(7-1)+16,16)]; //页面控件上的圆点间距基本在16左右。
[_pageControl.layer setCornerRadius:8]; // 圆角层
[_pageControl setBackgroundColor:[UIColor colorWithWhite:0.0 alpha:0.5]];
_pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];
[_backView addSubview:_pageControl];
NSArray *arr = [NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",nil];
for (int i = 0; i<7; i++) {
UIImageView *omg = [[UIImageView alloc]initWithFrame:CGRectMake(320*i, 0, 320, self.view.bounds.size.height)];
[_scrollView addSubview:omg];
omg.image = [UIImage imageNamed:[arr objectAtIndex:i]];
if (i == 6) {
bu = [UIButton buttonWithType:UIButtonTypeCustom];
bu.frame = CGRectMake(20, 400, 70, 40);
[omg addSubview:bu];
omg.userInteractionEnabled = YES;
[bu setImage:[UIImage imageNamed:@"点击前"] forState:UIControlStateNormal];
[bu addTarget:self action:@selector(ToMainView) forControlEvents:UIControlEventTouchUpInside];
}
}
}
- (void)guidView
{
//添加那一层view覆盖掉导航条
[[UIApplication sharedApplication].keyWindow addSubview:_backView];
//动画出现 从右向左
[UIView animateWithDuration:1.0 delay:0 options:UIViewAnimationOptionTransitionFlipFromRight animations:^{
_backView.frame = CGRectMake(0, 0, 320, 480);
} completion:^(BOOL finished) {
}];
}
//uiscrollview的代理 滑动的时候改变uipagecontrol的当前位置
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
//更新UIPageControl的当前页
CGPoint offset = scrollView.contentOffset;
CGRect bounds = scrollView.frame;
[_pageControl setCurrentPage:offset.x / bounds.size.width];
if (_pageControl.currentPage == 6) {
[UIView animateWithDuration:1.0 delay:0 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{
bu.frame = CGRectMake(20, 395, 120, 40);
} completion:^(BOOL finished) {
}];
}else{
bu.frame = CGRectMake(20, 400, 70, 40);
}
}
//当引导页走完时再动画消失 从左向右
- (void)ToMainView
{
[UIView animateWithDuration:1.5 delay:0 options:UIViewAnimationOptionTransitionFlipFromRight animations:^{
_backView.frame = CGRectMake(320, 0, 320, 480);
} completion:^(BOOL finished) {
_pageControl.currentPage = 0;
//从新设置uiscrollview的偏移量 当引导页消失后,把_scrollView从新放到开始的位置处,保证下次再次点击的时候还是从最开始的位置滑动
_scrollView.contentOffset = CGPointMake(0, 0);
bu.frame = CGRectMake(20, 400, 70, 40);
}];
}