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本文介绍了ios中获取系统相册中的图片，在很多应用中都能用到，可以获取单张图片，也可以同时获取多张图片，废话不多说了，看下面吧。
一.获取单张图片
思路:
1.利用uiimagepickercontroller可以从系统自带的app(照片\相机)中获得图片
2.设置代理,遵守代理协议
注意这个uiimagepickercontroller类比较特殊,需要遵守两个代理协议
@interface viewcontroller () <uiimagepickercontrollerdelegate, uinavigationcontrollerdelegate>
3.实现代理的方法didfinishpickingmediawithinfo
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- (void)getimagefromipc
{
// 1.判断相册是否可以打开
if (![uiimagepickercontroller issourcetypeavailable:uiimagepickercontrollersourcetypephotolibrary]) return;
// 2. 创建图片选择控制器
uiimagepickercontroller *ipc = [[uiimagepickercontroller alloc] init];
/**
typedef ns_enum(nsinteger, uiimagepickercontrollersourcetype) {
uiimagepickercontrollersourcetypephotolibrary, // 相册
uiimagepickercontrollersourcetypecamera, // 用相机拍摄获取
uiimagepickercontrollersourcetypesavedphotosalbum // 相簿
}
*/
// 3. 设置打开照片相册类型(显示所有相簿)
ipc.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
// ipc.sourcetype = uiimagepickercontrollersourcetypesavedphotosalbum;
// 照相机
// ipc.sourcetype = uiimagepickercontrollersourcetypecamera;
// 4.设置代理
ipc.delegate = self;
// 5.modal出这个控制器
[self presentviewcontroller:ipc animated:yes completion:nil];
}
#pragma mark -- <uiimagepickercontrollerdelegate>--
// 获取图片后的操作
- (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary<nsstring *,id> *)info
{
// 销毁控制器
[picker dismissviewcontrolleranimated:yes completion:nil];
// 设置图片
self.imageview.image = info[uiimagepickercontrolleroriginalimage];
}
二.获取多张图片
思路:
#import <assetslibrary/assetslibrary.h>
1.获得所有相簿的原图
- (void)getoriginalimages
{
// 获得所有的自定义相簿
phfetchresult<phassetcollection *> *assetcollections = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypealbum subtype:phassetcollectionsubtypealbumregular options:nil];
// 遍历所有的自定义相簿
for (phassetcollection *assetcollection in assetcollections) {
[self enumerateassetsinassetcollection:assetcollection original:yes];
}
// 获得相机胶卷
phassetcollection *cameraroll = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypesmartalbum subtype:phassetcollectionsubtypesmartalbumuserlibrary options:nil].lastobject;
// 遍历相机胶卷,获取大图
[self enumerateassetsinassetcollection:cameraroll original:yes];
}
2.获得所有相簿中的缩略图
- (void)getthumbnailimages
{
// 获得所有的自定义相簿
phfetchresult<phassetcollection *> *assetcollections = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypealbum subtype:phassetcollectionsubtypealbumregular options:nil];
// 遍历所有的自定义相簿
for (phassetcollection *assetcollection in assetcollections) {
[self enumerateassetsinassetcollection:assetcollection original:no];
}
// 获得相机胶卷
phassetcollection *cameraroll = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypesmartalbum subtype:phassetcollectionsubtypesmartalbumuserlibrary options:nil].lastobject;
[self enumerateassetsinassetcollection:cameraroll original:no];
}
3.遍历相册
/**
* 遍历相簿中的所有图片
* @param assetcollection 相簿
* @param original 是否要原图
*/
- (void)enumerateassetsinassetcollection:(phassetcollection *)assetcollection original:(bool)original
{
nslog(@"相簿名:%@", assetcollection.localizedtitle);
phimagerequestoptions *options = [[phimagerequestoptions alloc] init];
// 同步获得图片, 只会返回1张图片
options.synchronous = yes;
// 获得某个相簿中的所有phasset对象
phfetchresult<phasset *> *assets = [phasset fetchassetsinassetcollection:assetcollection options:nil];
for (phasset *asset in assets) {
// 是否要原图
cgsize size = original ? cgsizemake(asset.pixelwidth, asset.pixelheight) : cgsizezero;
// 从asset中获得图片
[[phimagemanager defaultmanager] requestimageforasset:asset targetsize:size contentmode:phimagecontentmodedefault options:options resulthandler:^(uiimage * _nullable result, nsdictionary * _nullable info) {
nslog(@"%@", result);
}];
}
}
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