圖片輪播功能

#import "ViewController.h"

 

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIScrollView *scorllView;

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad

{

    [super viewDidLoad];

    for(int i = 0;i<5;i++)

    {

        //實例化對象

        UIImageView *imageView = [[UIImageView alloc]init];

        //設置屬性

        CGFloat imageViewX = i*self.scorllView.frame.size.width;

        imageView.frame = CGRectMake(imageViewX, 0, self.scorllView.frame.size.width, self.scorllView.frame.size.height);

        imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"img_%02d",i]];

        

        [self.scorllView addSubview:imageView];

    }

    

    UIImageView *imageView = [self.scorllView.subviews lastObject];

    

    //第一種方式,獲取第五張圖片的寬

//    self.scorllView.contentSize = CGSizeMake(5*self.scorllView.frame.size.width, 0);

    //第二種方式,先拿到左後一張圖片,獲取他的x值,

    self.scorllView.contentSize = CGSizeMake(CGRectGetMaxX(imageView.frame), 0);

    

    

    

#pragma mark-----取消滾動條

    self.scorllView.showsHorizontalScrollIndicator = NO;

    self.scorllView.showsVerticalScrollIndicator = NO;

    

    //實現分頁效果

    self.scorllView.pagingEnabled = YES;

    //輪播方法

    //設置定時器

    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(scrollViewToScroll) userInfo:nil repeats:YES];

    

 

}

 

- (void)scrollViewToScroll

{

    //定時方法

    CGPoint offset = self.scorllView.contentOffset;

    

    if(offset.x >= 4*self.scorllView.frame.size.width)

    {

        offset.x = 0;

    }else

    {

        offset.x += self.scorllView.bounds.size.width;

    }

    

    [self.scorllView setContentOffset:offset animated:YES];

    

}

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

@end