ios 实现引导页面效果

//

//  ViewController.m

//  UIScrollView-分页

//

//  Created by  朱立志 on 14-5-1.

//  Copyright (c) 2014年  朱立志. All rights reserved.

//

#define count 5

#import "ViewController.h"

@interface ViewController ()

{

    UIPageControl *_control;

    UIScrollView *scrollView;

}

@end

@implementation ViewController

- (void)viewDidLoad

{

    [superviewDidLoad];

UIScrollView *uiScrollview = [[UIScrollViewalloc] init];

    uiScrollview.frame = self.view.bounds;

    CGFloat width = self.view.frame.size.width;

    CGFloat height = self.view.frame.size.height;

    

    [self.view addSubview:uiScrollview];

    

    for (int i = 0; i <count; i++) {

        NSString *imageName = [NSString stringWithFormat:@"pages.bundle/%d.jpg" ,i+1];

        UIImage *image = [UIImageimageNamed: imageName];

        UIImageView *imageView = [[UIImageViewalloc] initWithImage:image];

        imageView.frame = CGRectMake(i*width, 0, width, height);

        [uiScrollview addSubview:imageView];

    }

    scrollView = uiScrollview;

    uiScrollview.showsHorizontalScrollIndicator =NO;

    uiScrollview.contentSize = CGSizeMake(count*width, height);

    uiScrollview.pagingEnabled = YES;

    uiScrollview.backgroundColor = [UIColorgrayColor];

    uiScrollview.delegate = self;

    

    UIPageControl *control = [[UIPageControlalloc] init];

    control.numberOfPages = count;

    control.bounds = CGRectMake(0, 0, 200, 50);

    control.center = CGPointMake(width*0.5, height-50);

    control.currentPage = 0;

    _control = control;

    [_control addTarget:selfaction:@selector(onPointClick)forControlEvents:UIControlEventValueChanged];

    [self.view addSubview:control];

    

    

}

- (void) onPointClick

{

    NSLog(@"onPointClick");

    CGFloat offsetX = _control.currentPage * scrollView.frame.size.width;

    [UIView animateWithDuration:0.3animations:^{

        scrollView.contentOffset =CGPointMake(offsetX, 0);

    }];

    

}

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

    

    int pageNum = scrollView.contentOffset.x / scrollView.frame.size.width;

    _control.currentPage = pageNum;

}

@end