#import "TileViewController.h"
#import "SkimViewController.h"
#import "UIImageView+WebCache.h"

@interface TileViewController ()
{
    NSArray *_imageNames;
    UIScrollView *_scrollView;
}
@end

@implementation TileViewController


- (instancetype)initWithImageNames:(NSArray *)imageNames
{
    if (self = [super init]) {
        _imageNames = [[NSArray alloc] initWithArray:imageNames];
       
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //创建滚动视图
    [self createScrollView];
    //创建图片视图
    [self createImageViews];
}

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

- (void)createScrollView
{
    //取消对滚动视图内容的布局的影响
    if (@available(iOS 11.0, *)) {
        _scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }else {
        self.automaticallyAdjustsScrollViewInsets = NO;
    }
    CGSize size = self.view.frame.size;
    _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, size.width, size.height-kNavOffSet-40-50)];
    
    [self.view addSubview:_scrollView];
}

- (void)createImageViews
{
    CGSize size = _scrollView.frame.size;
    CGFloat gap =  1;
    CGFloat width = size.width/4-gap;
    CGFloat height = width;//width*3/2
    for (NSInteger i=0; i<_imageNames.count; i++) {

        UIImageView *imageView = [[UIImageView alloc] init];
        [imageView sd_setImageWithURL:[NSURL URLWithString:_imageNames[i]] placeholderImage:[UIImage imageNamed:@"NOImg"]];
        imageView.frame = CGRectMake(gap/2+i%4*(width+gap), gap+i/4*(height+gap), width, height);
        
        [_scrollView addSubview:imageView];
        _scrollView.contentSize = CGSizeMake(size.width, gap+(_imageNames.count+3)/4*(gap+height));
        
        //添加手势
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHandle:)];
        [imageView addGestureRecognizer:tap];
        //使用tag值记录图片数组中的下标
        imageView.tag = i;
        //打开交互
        imageView.userInteractionEnabled = YES;
    }
}

- (BOOL)prefersStatusBarHidden
{
    return self.navigationController.navigationBarHidden;
}

- (void)tapHandle:(UITapGestureRecognizer *)tap
{
    SkimViewController *svc = [[SkimViewController alloc] initWithImageNames:_imageNames index:tap.view.tag];
    
    [self.navigationController pushViewController:svc animated:NO];
    
    //告诉应用程序状态栏需要刷新(9.0以后不用管)
    [self setNeedsStatusBarAppearanceUpdate];
  
}

@end