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
{
[super
viewDidLoad];
UIScrollView *uiScrollview = [[UIScrollView
alloc] 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 = [UIImage
imageNamed: imageName];
UIImageView *imageView = [[UIImageView
alloc] 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 = [UIColor
grayColor];
uiScrollview.delegate =
self;

UIPageControl *control = [[UIPageControl
alloc] 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:self
action:@selector(onPointClick)
forControlEvents:UIControlEventValueChanged];
[self.view
addSubview:control];

}

- (void) onPointClick
{
NSLog(@"onPointClick");
CGFloat offsetX =
_control.currentPage * scrollView.frame.size.width;
[UIView animateWithDuration:0.3
animations:^{
scrollView.contentOffset =
CGPointMake(offsetX, 0);
}];

}

- (void)didReceiveMemoryWarning
{
[super
didReceiveMemoryWarning];
// 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