修复ipad下内存占用过高的问题

TZImagePickerController.podspec

 Pod::Spec.new do |s|
   s.name         = "TZImagePickerController"
-  s.version      = "1.4.3"
+  s.version      = "1.4.4"
   s.summary      = "A clone of UIImagePickerController, support picking multiple photos、original photo and video"
   s.homepage     = "https://github.com/banchichen/TZImagePickerController"
   s.license      = "MIT"
   s.author       = { "banchichen" => "736420282@qq.com" }
   s.platform     = :ios
   s.ios.deployment_target = "6.0"
-  s.source       = { :git => "https://github.com/banchichen/TZImagePickerController.git", :tag => "1.4.3" }
+  s.source       = { :git => "https://github.com/banchichen/TZImagePickerController.git", :tag => "1.4.4" }
   s.requires_arc = true
   s.resources    = "TZImagePickerController/TZImagePickerController/*.{png,xib,nib,bundle}"
   s.source_files = "TZImagePickerController/TZImagePickerController/*.{h,m}"

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -20,6 +20,9 @@
 
 @property (nonatomic, assign) BOOL shouldFixOrientation;
 
+/// Default is 540px / 默认540像素宽
+@property (nonatomic, assign) CGFloat photoPreviewMaxWidth;
+
 /// Return YES if Authorized 返回YES如果得到了授权
 - (BOOL)authorizationStatusAuthorized;
 

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -18,6 +18,8 @@
 @implementation TZImageManager
 
 static CGSize AssetGridThumbnailSize;
+static CGFloat TZScreenWidth;
+static CGFloat TZScreenScale;
 
 + (instancetype)manager {
     static TZImageManager *manager;
@@ -27,12 +29,15 @@ static CGSize AssetGridThumbnailSize;
         manager.cachingImageManager = [[PHCachingImageManager alloc] init];
         manager.cachingImageManager.allowsCachingHighQualityImages = NO;
         
+        TZScreenWidth = [UIScreen mainScreen].bounds.size.width;
         // 测试发现，如果scale在plus真机上取到3.0，内存会增大特别多。故这里写死成2.0
-        CGFloat scale = 2.0;
-        CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
+        TZScreenScale = 2.0;
+        if (TZScreenWidth > 600) {
+            TZScreenScale = 1.0;
+        }
         CGFloat margin = 4;
-        CGFloat itemWH = (screenWidth - 2 * margin - 4) / 4 - margin;
-        AssetGridThumbnailSize = CGSizeMake(itemWH * scale, itemWH * scale);
+        CGFloat itemWH = (TZScreenWidth - 2 * margin - 4) / 4 - margin;
+        AssetGridThumbnailSize = CGSizeMake(itemWH * TZScreenScale, itemWH * TZScreenScale);
     });
     return manager;
 }
@@ -309,21 +314,23 @@ static CGSize AssetGridThumbnailSize;
 
 /// Get photo 获得照片本身
 - (PHImageRequestID)getPhotoWithAsset:(id)asset completion:(void (^)(UIImage *, NSDictionary *, BOOL isDegraded))completion {
-    return [self getPhotoWithAsset:asset photoWidth:[UIScreen mainScreen].bounds.size.width completion:completion];
+    CGFloat fullScreenWidth = TZScreenWidth;
+    if (fullScreenWidth > _photoPreviewMaxWidth) {
+        fullScreenWidth = _photoPreviewMaxWidth;
+    }
+    return [self getPhotoWithAsset:asset photoWidth:fullScreenWidth completion:completion];
 }
 
 - (PHImageRequestID)getPhotoWithAsset:(id)asset photoWidth:(CGFloat)photoWidth completion:(void (^)(UIImage *, NSDictionary *, BOOL isDegraded))completion {
-    if (photoWidth > 600) photoWidth = 600.0;
     if ([asset isKindOfClass:[PHAsset class]]) {
         CGSize imageSize;
-        if (photoWidth < 150) {
+        if (photoWidth < TZScreenWidth && photoWidth < _photoPreviewMaxWidth) {
             imageSize = AssetGridThumbnailSize;
         } else {
             PHAsset *phAsset = (PHAsset *)asset;
             CGFloat aspectRatio = phAsset.pixelWidth / (CGFloat)phAsset.pixelHeight;
-            CGFloat multiple = 2.0;
-            CGFloat pixelWidth = photoWidth * multiple;
-            CGFloat pixelHeight = pixelWidth / aspectRatio;
+            CGFloat pixelWidth = photoWidth * TZScreenScale;
+            CGFloat pixelHeight = photoWidth / aspectRatio;
             imageSize = CGSizeMake(pixelWidth, pixelHeight);
         }
        PHImageRequestID imageRequestID = [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:imageSize contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
@@ -355,7 +362,7 @@ static CGSize AssetGridThumbnailSize;
             dispatch_async(dispatch_get_main_queue(), ^{
                 if (completion) completion(thumbnailImage,nil,YES);
                 
-                if (photoWidth == [UIScreen mainScreen].bounds.size.width) {
+                if (photoWidth == TZScreenWidth || photoWidth == _photoPreviewMaxWidth) {
                     dispatch_async(dispatch_get_global_queue(0,0), ^{
                         ALAssetRepresentation *assetRep = [alAsset defaultRepresentation];
                         CGImageRef fullScrennImageRef = [assetRep fullScreenImage];

TZImagePickerController/TZImagePickerController/TZImagePickerController.h

@@ -37,6 +37,9 @@
 /// Default is 828px / 默认828像素宽
 @property (nonatomic, assign) CGFloat photoWidth;
 
+/// Default is 520px / 默认540像素宽
+@property (nonatomic, assign) CGFloat photoPreviewMaxWidth;
+
 /// Default is 15, While fetching photo, HUD will dismiss automatic if timeout;
 /// 超时时间，默认为15秒，当取图片时间超过15秒还没有取成功时，会自动dismiss HUD；
 @property (nonatomic, assign) NSInteger timeout;

TZImagePickerController/TZImagePickerController/TZImagePickerController.m

@@ -87,6 +87,7 @@
         self.allowPickingImage = YES;
         self.timeout = 15;
         self.photoWidth = 828.0;
+        self.photoPreviewMaxWidth = 540;
         
         if (![[TZImageManager manager] authorizationStatusAuthorized]) {
             _tipLable = [[UILabel alloc] init];
@@ -118,6 +119,7 @@
         self.timeout = 15;
         self.photoWidth = 828.0;
         self.maxImagesCount = selectedAssets.count;
+        self.photoPreviewMaxWidth = 540;
         
         previewVc.photos = [NSMutableArray arrayWithArray:selectedPhotos];
         previewVc.currentIndex = index;
@@ -214,6 +216,16 @@
     }
 }
 
+- (void)setPhotoPreviewMaxWidth:(CGFloat)photoPreviewMaxWidth {
+    _photoPreviewMaxWidth = photoPreviewMaxWidth;
+    if (photoPreviewMaxWidth > 800) {
+        _photoPreviewMaxWidth = 800;
+    } else if (photoPreviewMaxWidth < 500) {
+        _photoPreviewMaxWidth = 500;
+    }
+    [TZImageManager manager].photoPreviewMaxWidth = _photoPreviewMaxWidth;
+}
+
 - (void)setSelectedAssets:(NSMutableArray *)selectedAssets {
     _selectedAssets = selectedAssets;
     _selectedModels = [NSMutableArray array];

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -124,6 +124,9 @@ static CGSize AssetGridThumbnailSize;
     [self scrollCollectionViewToBottom];
     // Determine the size of the thumbnails to request from the PHCachingImageManager
     CGFloat scale = 2.0;
+    if ([UIScreen mainScreen].bounds.size.width > 600) {
+        scale = 1.0;
+    }
     CGSize cellSize = ((UICollectionViewFlowLayout *)_collectionView.collectionViewLayout).itemSize;
     AssetGridThumbnailSize = CGSizeMake(cellSize.width * scale, cellSize.height * scale);
 }