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Pods/JXCategoryView/Sources/Image/JXCategoryImageCell.m

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+//
+//  JXCategoryImageCell.m
+//  JXCategoryView
+//
+//  Created by jiaxin on 2018/8/20.
+//  Copyright © 2018年 jiaxin. All rights reserved.
+//
+
+#import "JXCategoryImageCell.h"
+#import "JXCategoryImageCellModel.h"
+
+@interface JXCategoryImageCell()
+@property (nonatomic, strong) id currentImageInfo;
+@property (nonatomic, strong) NSString *currentImageName;
+@property (nonatomic, strong) NSURL *currentImageURL;
+@end
+
+@implementation JXCategoryImageCell
+
+- (void)prepareForReuse {
+    [super prepareForReuse];
+    
+    self.currentImageInfo = nil;
+    self.currentImageName = nil;
+    self.currentImageURL = nil;
+}
+
+- (void)initializeViews {
+    [super initializeViews];
+
+    _imageView = [[UIImageView alloc] init];
+    _imageView.contentMode = UIViewContentModeScaleAspectFit;
+    [self.contentView addSubview:_imageView];
+}
+
+- (void)layoutSubviews {
+    [super layoutSubviews];
+
+    JXCategoryImageCellModel *myCellModel = (JXCategoryImageCellModel *)self.cellModel;
+    self.imageView.bounds = CGRectMake(0, 0, myCellModel.imageSize.width, myCellModel.imageSize.height);
+    self.imageView.center = self.contentView.center;
+    if (myCellModel.imageCornerRadius && (myCellModel.imageCornerRadius != 0)) {
+        self.imageView.layer.cornerRadius = myCellModel.imageCornerRadius;
+        self.imageView.layer.masksToBounds = YES;
+    }
+}
+
+- (void)reloadData:(JXCategoryBaseCellModel *)cellModel {
+    [super reloadData:cellModel];
+
+    JXCategoryImageCellModel *myCellModel = (JXCategoryImageCellModel *)cellModel;
+    //因为`- (void)reloadData:(JXCategoryBaseCellModel *)cellModel`方法会回调多次，尤其是左右滚动的时候会调用无数次，如果每次都触发图片加载，会非常消耗性能。所以只会在图片发生了变化的时候，才进行图片加载。
+    if (myCellModel.loadImageBlock != nil) {
+        id currentImageInfo = myCellModel.imageInfo;
+        if (myCellModel.isSelected) {
+            currentImageInfo = myCellModel.selectedImageInfo;
+        }
+        if (currentImageInfo && ![currentImageInfo isEqual:self.currentImageInfo]) {
+            self.currentImageInfo = currentImageInfo;
+            if (myCellModel.loadImageBlock) {
+                myCellModel.loadImageBlock(self.imageView, currentImageInfo);
+            }
+        }
+    } else {
+        NSString *currentImageName;
+        NSURL *currentImageURL;
+        if (myCellModel.imageName) {
+            currentImageName = myCellModel.imageName;
+        } else if (myCellModel.imageURL) {
+            currentImageURL = myCellModel.imageURL;
+        }
+        if (myCellModel.isSelected) {
+            if (myCellModel.selectedImageName) {
+                currentImageName = myCellModel.selectedImageName;
+            } else if (myCellModel.selectedImageURL) {
+                currentImageURL = myCellModel.selectedImageURL;
+            }
+        }
+        if (currentImageName && ![currentImageName isEqualToString:self.currentImageName]) {
+            self.currentImageName = currentImageName;
+            self.imageView.image = [UIImage imageNamed:currentImageName];
+        } else if (currentImageURL && ![currentImageURL.absoluteString isEqualToString:self.currentImageURL.absoluteString]) {
+            self.currentImageURL = currentImageURL;
+            if (myCellModel.loadImageCallback) {
+                myCellModel.loadImageCallback(self.imageView, currentImageURL);
+            }
+        }
+    }
+    
+    if (myCellModel.isImageZoomEnabled) {
+        self.imageView.transform = CGAffineTransformMakeScale(myCellModel.imageZoomScale, myCellModel.imageZoomScale);
+    }else {
+        self.imageView.transform = CGAffineTransformIdentity;
+    }
+}
+
+@end