iOS图片浏览

#import <UIKit/UIKit.h>


@interface PickerView : UIView<UIScrollViewDelegate>

@property (nonatomic,strong) UIScrollView *scrollView;
@property (nonatomic,strong) UIPageControl *pageControl;
@property (nonatomic,strong) NSArray *dataAr;
@property (nonatomic,assign) NSInteger currentPageNum;
//创建实例
+ (PickerView *)initWithFrame:(CGRect)frame WithDataSurce:(NSArray *)dataAy SelectNum:(NSInteger)selectNum;

//展示界面
- (void)show;

//消失界面
- (void)dismiss;


@end

#import "PickerView.h"

@implementation PickerView

+ (PickerView *)initWithFrame:(CGRect)frame WithDataSurce:(NSArray *)dataAy SelectNum:(NSInteger)selectNum {
    PickerView *pickerView = [[self alloc]initWithFrame:frame];
    pickerView.dataAr = dataAy;
    pickerView.currentPageNum = selectNum;
    //根据参数初始化
    [pickerView initsubViews];
    return pickerView;
}
- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor blackColor];
        
        //滚动视图
        self.scrollView = [[UIScrollView alloc]init];
        [self.scrollView setBackgroundColor:[UIColor clearColor]];
        self.scrollView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
        self.scrollView.pagingEnabled = YES;
        self.scrollView.bounces = NO;
        self.scrollView.showsHorizontalScrollIndicator = NO;
        self.scrollView.showsVerticalScrollIndicator = NO;
        self.scrollView.delegate = self;
        [self addSubview:self.scrollView];
        
        //分页控件
        self.pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake((self.frame.size.width-100)/2.0,self.frame.size.height-22,100,18)];
        [self.pageControl setCurrentPageIndicatorTintColor:[UIColor whiteColor]];
        [self.pageControl setPageIndicatorTintColor:[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.6]];
        [self addSubview:self.pageControl];
    }
    return self;
}
- (void)initsubViews {
    self.scrollView.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    for (int i = 0; i < self.dataAr.count; i++) {
        NSDictionary *dic = [self.dataAr objectAtIndex:i];
        UIImage *image = [dic objectForKey:@"Image"];
        UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(self.frame.size.width*i, 0, self.frame.size.width, self.frame.size.height)];
        //设置imgView的停靠模式，图片按原比例显示，而非拉伸填充
        imgView.contentMode = UIViewContentModeScaleAspectFit;
        UITapGestureRecognizer *dissTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapToDismiss)];
        [imgView addGestureRecognizer:dissTap];
        imgView.userInteractionEnabled = YES;
        [imgView setImage:image];
        [self.scrollView addSubview:imgView];
    }
    self.scrollView.scrollEnabled = YES;
    self.scrollView.contentSize = CGSizeMake(self.frame.size.width*self.dataAr.count, self.frame.size.height);
    
    self.pageControl.numberOfPages = [self.dataAr count] > 1 ? [self.dataAr count] : 0 ;
    self.pageControl.currentPage = self.currentPageNum;
    //默认显示点击的图片
    [self.scrollView scrollRectToVisible:CGRectMake(self.frame.size.width*self.currentPageNum,0,self.frame.size.width,self.frame.size.height) animated:NO];
}
#pragma mark - Animated Mthod
- (void)animatedIn {
    self.transform = CGAffineTransformMakeScale(1.3, 1.3);
    self.alpha = 0;
    [UIView animateWithDuration:.35 animations:^{
        self.alpha = 1;
        self.transform = CGAffineTransformMakeScale(1, 1);
    }];
}

- (void)animatedOut {
    [UIView animateWithDuration:.35 animations:^{
        self.transform = CGAffineTransformMakeScale(1.3, 1.3);
        self.alpha = 0.0;
    } completion:^(BOOL finished) {
        if (finished) {
            [self removeFromSuperview];
        }
    }];
}

#pragma mark - show or hide self
- (void)show {
    UIWindow *keywindow = [[UIApplication sharedApplication] keyWindow];
    [keywindow addSubview:self];
    [self animatedIn];
}

- (void)dismiss {
    [self animatedOut];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self animatedOut];
}
//点击大图，移除
- (void)tapToDismiss
{
   [self animatedOut];
}
#pragma mark - scrollView delegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    CGPoint point = scrollView.contentOffset;
    self.pageControl.currentPage = (NSInteger)point.x/self.scrollView.frame.size.width;
}
@end