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QXLive/Third/ZLCollectionViewFlowLayout/ZLCollectionReusableView.m

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+//
+//  ZLCollectionReusableView.m
+//  ZLCollectionView
+//
+//  Created by zhaoliang chen on 2018/7/9.
+//  Copyright © 2018年 zhaoliang chen. All rights reserved.
+//
+
+#import "ZLCollectionReusableView.h"
+#import "ZLCollectionViewLayoutAttributes.h"
+
+@interface ZLCollectionReusableView ()
+
+@property(nonatomic,strong)UIImageView* ivBackground;
+
+@end
+
+@implementation ZLCollectionReusableView
+
+- (instancetype)initWithFrame:(CGRect)frame {
+    if (self == [super initWithFrame:frame]) {
+        self.translatesAutoresizingMaskIntoConstraints = NO;
+        [self addSubview:self.ivBackground];
+        self.ivBackground.translatesAutoresizingMaskIntoConstraints = NO;
+        [self addConstraints:@[
+            [NSLayoutConstraint constraintWithItem:self.ivBackground attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0],
+            [NSLayoutConstraint constraintWithItem:self.ivBackground attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1.0 constant: 0.0],
+            [NSLayoutConstraint constraintWithItem:self.ivBackground attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1.0 constant: 0.0],
+            [NSLayoutConstraint constraintWithItem:self.ivBackground attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1.0 constant: 0.0]
+            ]];
+    }
+    return self;
+}
+
+- (void)applyLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {
+    [super applyLayoutAttributes:layoutAttributes];
+    //设置背景颜色
+    ZLCollectionViewLayoutAttributes *ecLayoutAttributes = (ZLCollectionViewLayoutAttributes*)layoutAttributes;
+    if (ecLayoutAttributes.color) {
+        self.backgroundColor = ecLayoutAttributes.color;
+    }
+    if (ecLayoutAttributes.image) {
+        self.ivBackground.image = ecLayoutAttributes.image;
+    }
+}
+
+
+- (UIImageView*)ivBackground {
+    if (!_ivBackground) {
+        _ivBackground = [[UIImageView alloc]init];
+        _ivBackground.contentMode = UIViewContentModeScaleAspectFill;
+        _ivBackground.backgroundColor = [UIColor clearColor];
+    }
+    return _ivBackground;
+}
+
+@end