UI总结-UIScrollView

#import "ViewController.h"

#define WIDTH self.view.frame.size.width

#define HEIGHT self.view.frame.size.height

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

self.view.backgroundColor = [UIColor whiteColor];

UIScrollView *scr = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];

[self.view addSubview:scr];

scr.backgroundColor = [UIColor cyanColor];

[scr release];

//设置按页滑动

scr.pagingEnabled = YES;

//设置边界回弹

scr.bounces = NO;

//设置隐藏水平滚动条

scr.showsHorizontalScrollIndicator = NO;

//设置scrollView的重要属性,完事就可以滚动了(它可以滚动的范围)

scr.contentSize = CGSizeMake(WIDTH * 9, 0);

//将图片铺在scrollView上,通过改变scrollView的偏移量来将图片循环播放起来

//先铺中间的部分

for (NSInteger i = 0; i < 7; i++) {

UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH * (i + 1) , 0, WIDTH, HEIGHT)];

imagev.image = [UIImage imageNamed:[NSString stringWithFormat:@"h%ld.jpeg", i ]];

[scr addSubview:imagev];

[imagev release];

}

//在scrollView的第一页上铺最后一张图片

UIImageView *imagevi = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];

imagevi.image = [UIImage imageNamed:@"h6.jpeg"];

[scr addSubview:imagevi];

[imagevi release];

//在scrollView的最后一页上铺第一页图片

UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH * 8, 0, WIDTH, HEIGHT)];

imagev.image = [UIImage imageNamed:@"h0.jpeg"];

[scr addSubview:imagev];

[imagev release];

//第二个重要的属性:contentOffset(偏移量)

scr.contentOffset = CGPointMake(WIDTH, 0);

scr.tag = 1000;

scr.delegate = self;

//scrollView的缩放

//设置缩放比例,如果不设置,缩放无法操作

scr.maximumZoomScale = 2;

scr.minimumZoomScale = 0.5;

//加个定时器,可以让他自己循环播放

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changePic) userInfo:nil repeats:YES];

}

#pragma mark - 用来控制缩放的协议方法

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

return [scrollView.subviews firstObject];

}

#pragma mark - 只要scrollView一滑动,就会触发这个协议方法

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

NSLog(@"开始滑动");

}

#pragma mark - 滑动结束的时候触发这个方法.

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

UIScrollView *scr = (UIScrollView *)[self.view viewWithTag:1000];

if (scr.contentOffset.x == WIDTH * 8 ) {

scr.contentOffset = CGPointMake(WIDTH, 0);

}else if (scr.contentOffset.x == 0){

scr.contentOffset = CGPointMake(WIDTH * 7, 0);

}

}

- (void)changePic{

UIScrollView *scr = (UIScrollView *)[self.view viewWithTag:1000];

[scr setContentOffset:CGPointMake(scr.contentOffset.x + WIDTH, 0) animated:YES];

if (scr.contentOffset.x == WIDTH * 7) {

scr.contentOffset = CGPointMake(0, 0);

}

}

运行结果,不加计时器:

加了计时器以后,就可以自己动了,运行结果: