iOS引导页实现（一）

目前多数app在启动时会有引导页，今天给大家介绍一种比较直观，能够快速实现的引导页实现方法

最终效果就是有一个全屏的引导页，页面底部有UIPageControl 用来指示当前引导页为第几个页面

其中主要使用两个UI控件

    UIPageControl *pageControl; //指示当前处于第几个引导页
    UIScrollView *scrollView; //用于存放并显示引导页

首先，获取屏幕尺寸

//获取屏幕 宽度、高度
#define SCREEN_FRAME ([UIScreen mainScreen].bounds)
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)

初始化UI控件

    //初始化UI控件
    scrollView=[[UIScrollView alloc]initWithFrame:SCREEN_FRAME];
    scrollView.pagingEnabled=YES;
    [self.view addSubview:scrollView];

    pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(0, SCREEN_HEIGHT-50, SCREEN_WIDTH, 10)];
    pageControl.currentPageIndicatorTintColor=[UIColor colorWithRed:0.153 green:0.533 blue:0.796 alpha:1.0];
    [self.view addSubview:pageControl];
    pageControl.numberOfPages=3;

我们按照三个引导页来做，如果需要4个5个页面 可以修改pageControl.numberofPages;

创建三个UIImageView 并且初始化

<p style="margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: Menlo;">    <span style="font-size: 11px; color: rgb(112, 61, 170);">UIImageView</span> *imageViewOne;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: Menlo;">    <span style="font-size: 11px; color: rgb(112, 61, 170);">UIImageView</span> *imageViewTwo;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 15px; font-family: Menlo;">    <span style="font-size: 11px; color: rgb(112, 61, 170);">UIImageView</span> *imageViewThree;</p>

初始化第一个UIImageView

-(void)createViewOne{

    UIView *view = [[UIView alloc] initWithFrame:SCREEN_FRAME];

    imageViewOne = [[UIImageView alloc] initWithFrame:SCREEN_FRAME];
    imageViewOne.contentMode = UIViewContentModeScaleAspectFit;
    imageViewOne.image = [UIImage imageNamed:@"HelpFrist"];
    [view addSubview:imageViewOne];

    [scrollView addSubview:view];

}

其他两个类似方式实现

目前是效果出来了，但是引导页之间的相互切换还没有出来

下来需要给图片添加动作，当点击第一张图片的时候切换到第个引导页，点击第二个引导页切换到第三个引导页。

此处需要使用到给图片添加动作，可参考

http://blog.csdn.net/lwjok2007/article/details/46388935

还是一第一个图片为例，给上边的createViewOne方法再添加一段代码

-(void)createViewOne{

    UIView *view = [[UIView alloc] initWithFrame:SCREEN_FRAME];

    imageViewOne = [[UIImageView alloc] initWithFrame:SCREEN_FRAME];
    imageViewOne.contentMode = UIViewContentModeScaleAspectFit;
    imageViewOne.image = [UIImage imageNamed:@"HelpFrist"];
    [view addSubview:imageViewOne];

    UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress1:)];
    imageViewOne.userInteractionEnabled = YES;
    [imageViewOne addGestureRecognizer:singleTap1];

    [scrollView addSubview:view];

}

同时实现方法

buttonpress1

#pragma mark -- tap image
-(void)buttonpress1:(id)sender
{
    CGFloat pageWidth = CGRectGetWidth(self.view.bounds);
    CGPoint scrollPoint = CGPointMake(pageWidth, 0);
    [scrollView setContentOffset:scrollPoint animated:YES];

    pageControl.currentPage = 1;

}

其他两个仿照次方法即可

最终效果

源代码

#import "ViewController.h"

//获取屏幕 宽度、高度
#define SCREEN_FRAME ([UIScreen mainScreen].bounds)
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)

/**

 UIPageControl类提供一行点来指示当前显示的是多页面视图的哪一页。当然，由于UIPageControl类可视样式的点击不太好操作，所以最好是确保再添加了可选择的导航选项，以便让页面控件看起来更像一个指示器，而不是一个控件。当用户界面需要按页面进行显示时，使用UIPageControl控件将要显示的用户界面内容分页进行显示会使编程工作变得快捷。

 **/

@interface ViewController ()
{
    UIPageControl *pageControl; //指示当前处于第几个引导页
    UIScrollView *scrollView; //用于存放并显示引导页
    UIImageView *imageViewOne;
    UIImageView *imageViewTwo;
    UIImageView *imageViewThree;

}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //初始化UI控件
    scrollView=[[UIScrollView alloc]initWithFrame:SCREEN_FRAME];
    scrollView.pagingEnabled=YES;
    [self.view addSubview:scrollView];

    pageControl=[[UIPageControl alloc]initWithFrame:CGRectMake(0, SCREEN_HEIGHT-50, SCREEN_WIDTH, 10)];
    pageControl.currentPageIndicatorTintColor=[UIColor colorWithRed:0.153 green:0.533 blue:0.796 alpha:1.0];
    [self.view addSubview:pageControl];
    pageControl.numberOfPages=3;

    [self createViewOne];
    [self createViewTwo];
    [self createViewThree];

}

-(void)createViewOne{

    UIView *view = [[UIView alloc] initWithFrame:SCREEN_FRAME];

    imageViewOne = [[UIImageView alloc] initWithFrame:SCREEN_FRAME];
    imageViewOne.contentMode = UIViewContentModeScaleAspectFit;
    imageViewOne.image = [UIImage imageNamed:@"HelpFrist"];
    [view addSubview:imageViewOne];

    UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress1:)];
    imageViewOne.userInteractionEnabled = YES;
    [imageViewOne addGestureRecognizer:singleTap1];

    [scrollView addSubview:view];

}

-(void)createViewTwo{

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];
    imageViewTwo = [[UIImageView alloc] initWithFrame:SCREEN_FRAME];
    imageViewTwo.contentMode = UIViewContentModeScaleAspectFit;
    imageViewTwo.image = [UIImage imageNamed:@"HelpSecond"];
    [view addSubview:imageViewTwo];

    UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress2:)];
    imageViewTwo.userInteractionEnabled = YES;
    [imageViewTwo addGestureRecognizer:singleTap1];

    [scrollView addSubview:view];

}

-(void)createViewThree{

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(SCREEN_WIDTH*2, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];

    imageViewThree = [[UIImageView alloc] initWithFrame:SCREEN_FRAME];
    imageViewThree.contentMode = UIViewContentModeScaleAspectFit;
    imageViewThree.image = [UIImage imageNamed:@"HelpThree"];
    [view addSubview:imageViewThree];

    UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonpress3:)];
    imageViewThree.userInteractionEnabled = YES;
    [imageViewThree addGestureRecognizer:singleTap1];

    [scrollView addSubview:view];
}

#pragma mark -- tap image
-(void)buttonpress1:(id)sender
{
    CGFloat pageWidth = CGRectGetWidth(self.view.bounds);
    CGPoint scrollPoint = CGPointMake(pageWidth, 0);
    [scrollView setContentOffset:scrollPoint animated:YES];

    pageControl.currentPage = 1;

}

-(void)buttonpress2:(id)sender
{
    CGFloat pageWidth = CGRectGetWidth(self.view.bounds);
    CGPoint scrollPoint = CGPointMake(pageWidth*2, 0);
    [scrollView setContentOffset:scrollPoint animated:YES];

    pageControl.currentPage = 2;

}

-(void)buttonpress3:(id)sender
{
    NSLog(@"引导页完成");

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

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