iOS-UIScrollView+UIPageControl简单实现

#import "MJViewController.h"
#import "RootViewController.h"

@interface MJViewController () <UIScrollViewDelegate>
@property (strong, nonatomic) UIScrollView *scrollView;
@property (strong, nonatomic) UIPageControl *pageControl;
@property (strong, nonatomic) UIButton *nextBt;
@end

@implementation MJViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
   
    //初始化视图
    NSArray *array = [NSArray arrayWithObjects:[UIColor redColor],[UIColor blueColor],[UIColor yellowColor],[UIColor purpleColor],[UIColor whiteColor], nil];
    
 
    
    self.scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(10, 80, self.view.frame.size.width-20, self.view.frame.size.height-100)];
    self.scrollView.backgroundColor = [UIColor groupTableViewBackgroundColor];
    self.automaticallyAdjustsScrollViewInsets = NO;//恢复scrollview偏移
    self.scrollView.delegate = self;
    self.scrollView.pagingEnabled = YES; //分页属性
    self.scrollView.showsHorizontalScrollIndicator= NO;
    self.scrollView.showsVerticalScrollIndicator = NO;
    self.scrollView.contentSize = CGSizeMake((self.view.frame.size.width-20)*[array count], self.scrollView.frame.size.height); //内容范围
    
    [self.view addSubview:self.scrollView];
    
    self.pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(10,self.view.frame.size.height-50, self.view.frame.size.width-20, 20)];
//    self.pageControl.backgroundColor = [UIColor grayColor];
    self.pageControl.numberOfPages = array.count;
    self.pageControl.currentPage = 0;
    [self.view addSubview:self.pageControl];
    
    for (int i = 0; i<array.count; i++) {
        
        UIImageView *imageview = [[UIImageView alloc]initWithFrame:CGRectMake(i*self.scrollView.frame.size.width+5, 5, self.scrollView.frame.size.width-10, self.scrollView.frame.size.height-10)];
        imageview.backgroundColor = array[i];
        [self.scrollView addSubview:imageview];
        
        if (i==array.count-1) {
            
           imageview.userInteractionEnabled = YES;
       
       self.nextBt = [[UIButton alloc]initWithFrame:CGRectMake(0,0,200, 44)];
        _nextBt.alpha = 0.5;
        _nextBt.backgroundColor = [UIColor darkGrayColor];
        [_nextBt setTitle:@"开启致富之旅" forState:UIControlStateNormal];
        [_nextBt setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
        [_nextBt addTarget:self action:@selector(gotoAction) forControlEvents:UIControlEventTouchUpInside];
        [imageview  addSubview:self.nextBt];
        }
    }
}
-(void)gotoAction{

RootViewController *rootVC = [[RootViewController alloc]init];
    [self presentModalViewController:rootVC animated:YES];
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

if ([scrollView isMemberOfClass:[UITableView class]]) {
        
    }else{
    
        
        //在scrollViewDidScroll内实现监听contentOffset内容偏移量；根据contentOffset计算当前属于哪一页；
        int index = fabs(scrollView.contentOffset.x)/scrollView.frame.size.width;//当前是第几个视图
        self.pageControl.currentPage = index;
    }
}

然后在代理里面记得实现：

#pragma mark - 引导页
- (void)setIntroductionViewController
{
    //读取沙盒数据
    NSUserDefaults * settings1 = [NSUserDefaults standardUserDefaults];
    NSString *key1 = [NSString stringWithFormat:@"is_first"];
    NSString *value = [settings1 objectForKey:key1];
    if (!value) {//如果没有数据
        //***
        //引导页
        introductionVC = [[DMIntroductionViewController alloc]init];
        [UIApplication sharedApplication].delegate.window.rootViewController = introductionVC;

}
    
}
@end