解决6plus真机上内存占用高的问题

TZImagePickerController.podspec

 Pod::Spec.new do |s|
   s.name         = "TZImagePickerController"
-  s.version      = "1.4.2"
+  s.version      = "1.4.3"
   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 => "1.4.2" }
+  s.source       = { :git => "https://github.com/banchichen/TZImagePickerController.git", :tag => "1.4.3" }
   s.requires_arc = true
   s.resources    = "TZImagePickerController/TZImagePickerController/*.{png,xib,nib,bundle}"
   s.source_files = "TZImagePickerController/TZImagePickerController/*.{h,m}"

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -27,7 +27,8 @@ static CGSize AssetGridThumbnailSize;
         manager.cachingImageManager = [[PHCachingImageManager alloc] init];
         manager.cachingImageManager.allowsCachingHighQualityImages = NO;
         
-        CGFloat scale = [UIScreen mainScreen].scale;
+        // 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;
         CGFloat margin = 4;
         CGFloat itemWH = (screenWidth - 2 * margin - 4) / 4 - margin;
@@ -320,7 +321,7 @@ static CGSize AssetGridThumbnailSize;
         } else {
             PHAsset *phAsset = (PHAsset *)asset;
             CGFloat aspectRatio = phAsset.pixelWidth / (CGFloat)phAsset.pixelHeight;
-            CGFloat multiple = [UIScreen mainScreen].scale;
+            CGFloat multiple = 2.0;
             CGFloat pixelWidth = photoWidth * multiple;
             CGFloat pixelHeight = pixelWidth / aspectRatio;
             imageSize = CGSizeMake(pixelWidth, pixelHeight);

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -123,7 +123,7 @@ static CGSize AssetGridThumbnailSize;
     [super viewWillAppear:animated];
     [self scrollCollectionViewToBottom];
     // Determine the size of the thumbnails to request from the PHCachingImageManager
-    CGFloat scale = [UIScreen mainScreen].scale;
+    CGFloat scale = 2.0;
     CGSize cellSize = ((UICollectionViewFlowLayout *)_collectionView.collectionViewLayout).itemSize;
     AssetGridThumbnailSize = CGSizeMake(cellSize.width * scale, cellSize.height * scale);
 }