iOS中一个图展的实现

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在app的首页一般都会有图展，用于显示广告，或者头条。典型的是网易的新闻客户端

如图，红框框的位置就是一个典型的图展，

熟悉iOS的人肯定知道，这个是个UIScrollview,里面加几张图片即可实现，当然下面的三个小点点也是必不可少的。

那做这个东西的思路就很明晰了：首先这个类是个scrollview，然后在这个scrollview中添加imageview，然后给每个imageview添加相应的事件即可。

源代码如下：

头文件：

////  GalleryView.h//  Pitch////  Created by zhujinhui on 14-9-1.//  Copyright (c) 2014年 zhujinhui. All rights reserved.//#import <UIKit/UIKit.h>/** * the protocol of the gallery */@protocol GalleryDelegate <NSObject>-(void)galleryViewItemDidClicked:(int)index;@end/**  gallery is used to show a lot of images  */@interface GalleryView : UIScrollView@property (assign ,nonatomic) id<GalleryDelegate> mDelegate;/** * set all the image to gallery */-(void)setData:(NSArray *) data;@end

实现文件：

////  GalleryView.m//  Pitch////  Created by zhujinhui on 14-9-1.//  Copyright (c) 2014年 zhujinhui. All rights reserved.//#import "GalleryView.h"#define TAG_BTN_OFFSET 12345@implementation GalleryView- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}/** * set all the image to gallery */-(void)setData:(NSArray *) data{    //if data is not a array of string,it will throw exception    @try {        //remove all the subview from gallery view        for (UIView *view in self.subviews) {            [view removeFromSuperview];        }                //add view to gallery        for (int index = 0; index < [data count]; ++index) {            NSString *imageName = data[index];            UIImage *img = [UIImage imageNamed:imageName];            UIImageView *imgv = [[UIImageView alloc]initWithImage:img];            CGRect frame = CGRectMake(index * 320, 0, 320, 150);            [imgv setFrame:frame];            //add gesture to image            imgv.userInteractionEnabled = YES;            UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]init];            [tapGestureRecognizer addTarget:self action:@selector(tapped:)];            [imgv addGestureRecognizer:tapGestureRecognizer];                        //set tag            imgv.tag = TAG_BTN_OFFSET + index;            [self addSubview:imgv];        }            }    @catch (NSException *exception) {        NSLog(@"%@",exception);    }}-(BOOL)tapped:(UIGestureRecognizer *)gestureRecognizer{    //force convert index to integer    int index = (int) (gestureRecognizer.view.tag - TAG_BTN_OFFSET);    if (self.mDelegate) {        if ([self.mDelegate respondsToSelector:@selector(galleryViewItemDidClicked:)]) {            [self.mDelegate galleryViewItemDidClicked:index];        }    }else{        NSLog(@"please set delegate");    }        return TRUE;}-(void)awakeFromNib{        }/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code}*/@end

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