PhotoBrowser

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#####providing an easy way to reach the effect that looking through photos likes the system photo app(快速集成图片浏览器, 支持网络, 本地,以及各种手势)

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##使用示例效果

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可以简单快速灵活的实现上图中的效果

注意, 代码依赖 Kingfisher, 请先在您的项目中添加Kingfisher框架

attention please PhotoBrowser relys on 'Kingfisher'

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Feature

• providing an easy way to reach the effect that looking through photos likes the system photo app
• support rotation

书写思路移步

###简书1

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Requirements

• iOS 8.0+
• Xcode 7.3 or above

Installation

• CocoaPods add these lines to your project's file 'Podfile'

source 'https://github.com/CocoaPods/Specs.git'

platform :ios, '8.0' use_frameworks!

pod 'ZJPhotoBrowser', '~> 0.1.0'

• 直接下载将下载文件的PhotoBrowser文件夹下的文件拖进您的项目中就可以使用了
• or drag the downloaded file 'PhotoBrowser' to your project

###Usage

一. 本地图片使用示例(load local images' example)

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    1. 设置photoModels
    func setPhoto() -> [PhotoModel] {
        var photos: [PhotoModel] = []
        for (index, image) in images.enumerate() {
	        //  这个方法只能返回可见的cell, 如果不可见, 返回值为nil
            let cell = collectionView.cellForItemAtIndexPath(NSIndexPath(forRow: index, inSection: 0)) as? TestCell
            let sourceView = cell?.imageView
			// 在这里设置本地图片的photoModel, 注意指定的sourceImageView是图片的imageView,用来执行动画和设置初始图片
            let photoModel = PhotoModel(localImage: image, sourceImageView: sourceView, description: nil)
            photos.append(photoModel)
        }
        return photos
    }
    
    // 2. 初始化PhotoBrowser
    let photoBrowser = PhotoBrowser(photoModels: setPhoto())
    // 3. 设置初始的页数
    photoBrowser.showWithBeginPage(indexPath.row)
}

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二. 网络图片使用(load network images' example)

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    1. 设置photoModels
    func setPhoto() -> [PhotoModel] {
        var photos: [PhotoModel] = []
        for (index, photoURLString) in photosURLString.enumerate() {
            // 这个方法只能返回可见的cell, 如果不可见, 返回值为nil
            let cell = collectionView.cellForItemAtIndexPath(NSIndexPath(forRow: index, inSection: 0)) as? TestCell
            let sourceView = cell?.imageView
            
            // 这里设置网络图片的photoModel 注意指定的sourceImageView是图片的imageView,用来执行动画和设置初始图片
            let photoModel = PhotoModel(imageUrlString: photoURLString, sourceImageView: sourceView, description: nil)
            photos.append(photoModel)
        }
        return photos
    }
    
    // 2. 初始化PhotoBrowser
    let photoBrowser = PhotoBrowser(photoModels: setPhoto())
    // 3. 设置初始的页数
    photoBrowser.showWithBeginPage(indexPath.row)
}

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三. 使用代理,动态更新sourceImageView和进行更多的操作(using delegate to do more useful work)

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    1. 设置photoModels
    func setPhoto() -> [PhotoModel] {
        var photos: [PhotoModel] = []
        for photoURLString in photosURLString {
            // 初始化不设置sourceImageView,也可以设置, 如果sourceImageView是不需要动态改变的, 那么推荐不需要代理设置sourceImageView
            // 而在代理方法中动态更新,将会覆盖原来设置的sourceImageView
            let photoModel = PhotoModel(imageUrlString: photoURLString, sourceImageView: nil, description: nil)
            photos.append(photoModel)
        }
        return photos
    }
    // 2. 初始化PhotoBrowser
    let photoBrowser = PhotoBrowser(photoModels: setPhoto())
    // 3. 指定代理
    photoBrowser.delegate = self
    // 4. 设置初始的页数
    photoBrowser.showWithBeginPage(indexPath.row)
}   

代理使用示例(the delegate's method use example)

// 正在展示的页
// 因为通过 collectionView.cellForItemAtIndexPath(currentIndexPath)
// 这个方法只能获取到当前显示在collectionView中的cell, 否则返回nil,
// 所以如果是在浏览图片的时候的页数对应的currentIndexPath已经不在collectionView的可见cell范围内
// 返回的将是nil, 就不能准确的获取到 sourceImageView 
// 故在每次显示图片的时候判断如果对应的sourceImageView cell已经不可见
// 那么就更新collectionView的位置, 滚动到相应的cell
// 当然更新collectionView位置的方法很多, 这里只是示例
func photoBrowserDidDisplayPage(currentPage: Int, totalPages: Int) {
    let visibleIndexPaths = collectionView.indexPathsForVisibleItems()
    
    let currentIndexPath = NSIndexPath(forRow: currentPage, inSection: 0)
    if !visibleIndexPaths.contains(currentIndexPath) {
        collectionView.scrollToItemAtIndexPath(currentIndexPath, atScrollPosition: .Top, animated: false)
    }
}
// 获取动态改变的sourceImageView
func sourceImageViewForCurrentIndex(index: Int) -> UIImageView? {
    
    let currentIndexPath = NSIndexPath(forRow: index, inSection: 0)
    
    let cell = collectionView.cellForItemAtIndexPath(currentIndexPath) as? TestCell
    let sourceView = cell?.imageView
    return sourceView
}

如果你在使用中遇到问题: 可以通过简书私信给我

License

PhotoBrowser is released under the MIT license. See LICENSE for details.