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三. Requirement

iOS 6 or later. Requires ARC
iOS6及以上系统可使用. ARC环境.

When system version is iOS6 or iOS7, Using AssetsLibrary.
When system version is iOS 8 or later, Using PhotoKit.
如果运行在iOS6或7系统上,用的是AssetsLibrary库获取照片资源。

2016.5.23更新: 刚刚更新了代码,现在版本更新到了1.4.5,新增了一些新功能,比如:在照片列表页新增了拍照按钮,可以全局记录哪个相册已选中了多少张图片,预览控制器可以在外界打开。同时Demo页面也做了一些优化,可以直接删除选中的照片、可以对照片进行长按排序等。当然期间也修复了许多小bug,表现更加好了。

最值得一提的是,1.4.5版本的性能大幅提升了,在我的iOS9.3.2系统6s设备上(870张照片),平均滑动帧数在58左右,滑动十分流畅,在iOS7.0.4的4s设备上(124张照片),平均滑动帧数在57左右,也十分流畅。经过对比,和QQ的图片选择器滑动帧数表现基本一致,都十分流畅,同时都强于微信的图片选择器。微信的图片选择器,在快速滑动的时候明显感到有一丝卡顿,通过Core Animation查看发现,微信的图片选择器在我的6s设备下帧数平均约52左右,好几次甚至低于50,在4s设备上则表现更糟一些。下面贴上帧数测试截图,大家也可以测试一下~(测试截图请去博客查看~)

tip: 如果你用的是老版本,建议你更新到新版,特别是需要适配iOS7甚至6的应用,因为旧版本在iOS7和6下性能比较糟糕...

2016.6.22更新: 刚刚更新了代码,现在版本更新到了1.5.0。更新如下: 1.可把拍照按钮放在外面了,可以设置弹出一个sheet提示用户选择相册或相机; 2.新增了sortAscendingByModificationDate属性,默认为YES,设置为NO时,照片会按修改时间降序,拍照按钮会在第一个; 3.优化了Demo页面的UI,新增6个开关控件,可方便地更改各个设置来打开选择器; 4.修复了若干bug;

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