//
//  MainViewController.m
//  UI06_UIScorollView
//
//  Created by dllo on 15/8/5.
//  Copyright (c) 2015年 zhozhicheng. All rights reserved.
//

#import MainViewController.h
//定義兩個宏,分別為屏幕尺寸的寬,高
#define WIDTH self.view.frame.size.width
#define HEIGHT self.view.frame.size.height

@interface MainViewController ()
@property(nonatomic,retain)UIScrollView *scrollView;

@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor=[UIColor yellowColor];
    //創建一個scrollView,和View尺寸一樣大
    UIScrollView *scrollView=[[UIScrollView alloc] initWithFrame:self.view.frame];
    scrollView.backgroundColor=[UIColor redColor];
    [self.view addSubview:scrollView];
    [scrollView release];
    //重要的屬性,這個屬性可以讓ScrollView滾動起來
    //contenSize設置scrollView的滾動范圍
    scrollView.contentSize =CGSizeMake(15 * WIDTH, HEIGHT);
    //按頁來進行滾動
    scrollView.pagingEnabled=YES;
    //
    for (NSInteger i=0; i < 13; i++) {
        //最常用的拼接
        NSString *picName =[NSString stringWithFormat:@cymbal_%02ld.jpg,i];
        //通過圖片名來創建UIImageView
        UIImageView *imageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:picName]];
        //設置每一張圖片的起始位置
        imageView.frame=CGRectMake(((i+1) * WIDTH),0, WIDTH, HEIGHT);
        //把imageView圖片放到scrollView
        [scrollView addSubview:imageView];
        [imageView release];
    }
    //額外添加兩張圖,一張放在第一個,一個放在最後一個,對應的上面的整體范圍+2
    UIImageView *last=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@cymbal_00.jpg]];
    last.frame=CGRectMake(14 * WIDTH, 0, WIDTH, HEIGHT);
    [scrollView addSubview:last];
    [last release];

    UIImageView *FIRST=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@cymbal_12.jpg]];
    FIRST.frame=CGRectMake(0 * WIDTH, 0, WIDTH, HEIGHT);
    [scrollView addSubview:FIRST];
    [FIRST release];

    //偏移量(把第幾張放到最前面)
    scrollView.contentOffset=CGPointMake(WIDTH , 0);
    //關掉邊界回彈效果,默認是YES
    scrollView.bounces=NO;
    //關閉滾動條,豎直,橫的  水平和豎直兩個滾動條會作為兩個子視圖添加到scrollView的子視圖中,如果把滾動條效果關閉,這兩個視圖就不會添加到子視圖中
    scrollView.showsHorizontalScrollIndicator=NO;
    scrollView.showsVerticalScrollIndicator=NO;
    //設置代理人
    scrollView.delegate=self;
    scrollView.tag=1000;

    //創建一個計時器
    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(changeImage) userInfo:nil repeats:YES];
}
#pragma mark 只要滾動就會觸發的協議方法
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (CGPointEqualToPoint(scrollView.contentOffset, CGPointMake(WIDTH * 14, 0))) {
        scrollView.contentOffset=CGPointMake(WIDTH, 0);
    }
    if (CGPointEqualToPoint(scrollView.contentOffset, CGPointMake(0, 0))) {
        scrollView.contentOffset=CGPointMake(WIDTH * 13, 0);
    }

}
#pragma mark 當scrollView減速時觸發停止
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@滾動停止);

}
-(void)changeImage
{
    //通過tag找scrollView
    UIScrollView *scrollView=(UIScrollView *)[self.view viewWithTag:1000];
//    scrollView.contentOffset=CGPointMake(scrollView.contentOffset.x + WIDTH, 0);
    [scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x + WIDTH, 0) animated:YES];
    if (scrollView.contentOffset.x ==WIDTH * 14) {
        scrollView.contentOffset =CGPointMake(WIDTH, 0);
    }

}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end