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#import "XMGSeeBigPictureViewController.h"
#import <UIImageView+WebCache.h>
#import "XMGTopic.h"
#import <SVProgressHUD.h>
#import <AssetsLibrary/AssetsLibrary.h>
@interface XMGSeeBigPictureViewController () <UIScrollViewDelegate>
/** 图片 */
@property (nonatomic, weak) UIImageView *imageView;
/** 相册库 */
@property (nonatomic, strong) ALAssetsLibrary *library;
@end
@implementation XMGSeeBigPictureViewController
- (ALAssetsLibrary *)library
{
if (!_library) {
_library = [[ALAssetsLibrary alloc] init];
}
return _library;
}
- (IBAction)back {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)viewDidLoad {
[super viewDidLoad];
// 滚动控件
UIScrollView *scrollView = [[UIScrollView alloc] init];
scrollView.frame = [UIScreen mainScreen].bounds;
scrollView.backgroundColor = [UIColor blackColor];
scrollView.delegate = self;
[self.view insertSubview:scrollView atIndex:0];
// 图片
UIImageView *imageView = [[UIImageView alloc] init];
[imageView sd_setImageWithURL:[NSURL URLWithString:self.topic.image1]];
[scrollView addSubview:imageView];
self.imageView = imageView;
// 图片的尺寸
imageView.x = 0;
imageView.width = XMGScreenW;
imageView.height = self.topic.height * imageView.width / self.topic.width;
if (imageView.height > XMGScreenH) { // 图片过长
imageView.y = 0;
scrollView.contentSize = CGSizeMake(0, imageView.height);
} else { // 图片居中显示
imageView.centerY = XMGScreenH * 0.5;
}
// 伸缩
CGFloat maxScale = self.topic.height / imageView.height;
if (maxScale > 1.0) {
scrollView.maximumZoomScale = maxScale;
}
}
static NSString * const XMGGroupNameKey = @"XMGGroupNameKey";
static NSString * const XMGDefaultGroupName = @"03期-百思不得姐";
- (NSString *)groupName
{
// 先从沙盒中取得名字
NSString *groupName = [[NSUserDefaults standardUserDefaults] stringForKey:XMGGroupNameKey];
if (groupName == nil) { // 沙盒中没有存储任何文件夹的名字
groupName = XMGDefaultGroupName;
// 存储名字到沙盒中
[[NSUserDefaults standardUserDefaults] setObject:groupName forKey:XMGGroupNameKey];
[[NSUserDefaults standardUserDefaults] synchronize];
}
return groupName;
}
- (IBAction)save
{
// 获得文件夹的名字
__block NSString *groupName = [self groupName];
// self的弱引用
XMGWeakSelf;
// 图片库
__weak ALAssetsLibrary *weakLibrary = self.library;
// 创建文件夹
[weakLibrary addAssetsGroupAlbumWithName:groupName resultBlock:^(ALAssetsGroup *group) {
if (group) { // 新创建的文件夹
// 添加图片到文件夹中
[weakSelf addImageToGroup:group];
} else { // 文件夹已经存在
[weakLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
NSString *name = [group valueForProperty:ALAssetsGroupPropertyName];
if ([name isEqualToString:groupName]) { // 是自己创建的文件夹
// 添加图片到文件夹中
[weakSelf addImageToGroup:group];
*stop = YES; // 停止遍历
} else if ([name isEqualToString:@"Camera Roll"]) {
// 文件夹被用户强制删除了
groupName = [groupName stringByAppendingString:@" "];
// 存储新的名字
[[NSUserDefaults standardUserDefaults] setObject:groupName forKey:XMGGroupNameKey];
[[NSUserDefaults standardUserDefaults] synchronize];
// 创建新的文件夹
[weakLibrary addAssetsGroupAlbumWithName:groupName resultBlock:^(ALAssetsGroup *group) {
// 添加图片到文件夹中
[weakSelf addImageToGroup:group];
} failureBlock:nil];
}
} failureBlock:nil];
}
} failureBlock:nil];
}
/**
* 添加一张图片到某个文件夹中
*/
- (void)addImageToGroup:(ALAssetsGroup *)group
{
__weak ALAssetsLibrary *weakLibrary = self.library;
// 需要保存的图片
CGImageRef image = self.imageView.image.CGImage;
// 添加图片到【相机胶卷】
[weakLibrary writeImageToSavedPhotosAlbum:image metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
[weakLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
// 添加一张图片到自定义的文件夹中
[group addAsset:asset];
[SVProgressHUD showSuccessWithStatus:@"保存成功!"];
} failureBlock:nil];
}];
}
- (void)getAllPhotos
{
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// 遍历所有的文件夹, 一个ALAssetsGroup对象就代表一个文件夹
[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
// 遍历文件夹内的所有多媒体文件（图片、视频）, 一个ALAsset对象就代表一张图片
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
// 缩略图
XMGLog(@"%@", [UIImage imageWithCGImage:result.thumbnail]);
// 获得原始图片
// XMGLog(@"%@", [UIImage imageWithCGImage:result.defaultRepresentation.fullResolutionImage]);
}];
} failureBlock:nil];
}
// 自定义照相机 : AVCaptureSession <AVFoundation/AVFoundation.h>
// 通过拍照获得一张图片
// UIImagePickerController *picker = [[UIImagePickerController alloc] init];
// picker.sourceType = UIImagePickerControllerSourceTypeCamera;
// [self presentViewController:picker animated:YES completion:nil];
// 从相册中挑选一张图片
// UIImagePickerController *picker = [[UIImagePickerController alloc] init];
// picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
// [self presentViewController:picker animated:YES completion:nil];
#pragma mark - <UIScrollViewDelegate>
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.imageView;
}
@end
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原文地址：http://www.cnblogs.com/yedayi/p/5140572.html
