iOS滚动视图UIScrollView

#import "TRRootAViewController.h"
#import "TRrootBViewController.h"
#define SCROLL_W 320
#define SCROLL_h 568-64

@interface TRRootAViewController ()<UIScrollViewDelegate>
@property (nonatomic,strong)UIScrollView *scroll;
@property (nonatomic,strong)UILabel *titlelabel;
@property(nonatomic,strong)TRrootBViewController *bvc;
@end

@implementation TRRootAViewController

#pragma mark 状态监测
//当滚动视图停止下来 得到一个通知 滚动视图就会用contentoddset反映出滚动视图的最终的位置
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
NSLog(@"offset.x=%d",(int)scrollView.contentOffset.x);
}
//用户手指在屏幕上向某个方向拖动
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
NSLog(@"水平或竖直方向拖动");
}

-(void)scrollViewDidZoom:(UIScrollView *)scrollView{
NSLog(@"拖动结束");
}
//用户的手指已经从屏幕上移开而视图需要继续移动调用这个方法
//从用户手指抬前的位置
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
NSLog(@"将要停止的时候调用");
}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
NSLog(@"拖动结束");
}

-(void)creatUIscrollView
{
self.scroll = [[UIScrollView alloc]init]; //初始化
self.scroll.frame = CGRectMake(0, 0, 320, 568); //视图大小
self.scroll.contentSize = CGSizeMake(SCROLL_W*6, SCROLL_h); //滚动范围
self.scroll.pagingEnabled = YES;//分页
self.scroll.bounces = YES; //弹簧
self.scroll.delegate = self;  //协议
self.scroll.userInteractionEnabled=YES;//用户交互
[self.view addSubview:self.scroll];

//给每个imgView添加图片
for (int i=0; i<6; i++)
{
UIImage *img=[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i+1]];
UIImageView *imgview=[[UIImageView alloc]initWithImage:img];
imgview.frame=CGRectMake(SCROLL_W * i, 0, SCROLL_W, SCROLL_h);//设置imgview的frame
[self.scroll addSubview:imgview];
}

UIButton *prebtn = [UIButton buttonWithType:UIButtonTypeSystem];
prebtn.backgroundColor = [UIColor redColor];
prebtn.tag=101;
prebtn.frame = CGRectMake(20, 420, 50, 40);
[prebtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:prebtn];

UIButton *hombtn=[UIButton buttonWithType:UIButtonTypeSystem];
hombtn.backgroundColor=[UIColor redColor];
hombtn.tag=102;
hombtn.frame=CGRectMake(160-20, 420, 50, 40);
[hombtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:hombtn];

UIButton *nextbtn=[UIButton buttonWithType:UIButtonTypeSystem];
nextbtn.backgroundColor=[UIColor redColor];
nextbtn.tag=103;
nextbtn.frame=CGRectMake(320-65, 420, 50, 40);
[nextbtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:nextbtn];

self.titlelabel=[[UILabel alloc]initWithFrame:CGRectMake(160, 64, 80, 40)];
self.titlelabel.text=@"第1页";
[self.view addSubview:self.titlelabel];
}

-(void)btnClick:(UIButton *)btn{

int currentlndex=self.scroll.contentOffset.x/320;

if (103==btn.tag) {

NSLog(@"offset.x%f",self.scroll.contentOffset.x);

if (self.scroll.contentOffset.x<=4*320) {
[self.scroll setContentOffset:CGPointMake(self.scroll.contentOffset.x+320, 0) animated:YES];
currentlndex++;
}

}
else if(101==btn.tag){

if (self.scroll.contentOffset.x>=320) {
[self.scroll setContentOffset:CGPointMake(self.scroll.contentOffset.x-320, 0) animated:YES];
currentlndex--;
}
}
else if(102==btn.tag){

[self.scroll setContentOffset:CGPointMake(0, 0) animated:YES];
currentlndex=0;

}
self.titlelabel.text=[NSString stringWithFormat:@"第%d页",currentlndex+1];

}

- (void)viewDidLoad
{
[super viewDidLoad];
[self creatUIscrollView];
}