UICollectionView居左显示 且自适应大小

- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect{
    
    NSArray *array = [super layoutAttributesForElementsInRect:rect];
    for (int i = 0; i < array.count; i ++) {
        if (i != array.count - 1){
            UICollectionViewLayoutAttributes *currentAtt = array[i];
            UICollectionViewLayoutAttributes *nextAtt = array[i+1];
            if (CGRectGetMinY(currentAtt.frame) == CGRectGetMinY(nextAtt.frame)) {
                if ((CGRectGetMinX(nextAtt.frame) - CGRectGetMaxX(currentAtt.frame)) > self.minimumInteritemSpacing){
                    CGRect frame = nextAtt.frame;
                    CGFloat x = CGRectGetMaxX(currentAtt.frame) + self.minimumInteritemSpacing;
                    frame = CGRectMake(x, CGRectGetMinY(frame), frame.size.width, frame.size.height);
                    nextAtt.frame = frame;
                }
            }else{
                //下一列自动居左  避免被居中
                CGRect frame = nextAtt.frame;
                frame = CGRectMake(self.sectionInset.left, frame.origin.y, frame.size.width, frame.size.height);
                nextAtt.frame = frame;
            }
            if (i == 0){
                //第一个列 避免被居中
                CGRect frame = currentAtt.frame;
                frame = CGRectMake(self.sectionInset.left, frame.origin.y, frame.size.width, frame.size.height);
                currentAtt.frame = frame;
            }
        }
        else if (i == 0){
            //第一列 避免被居中 如果有分区头视图  可注释该判断  添加判断是否为头视图
           //因为该layoutAttributes数组包含 头视图，如添加头视图，请在前面添加判断
            UICollectionViewLayoutAttributes *currentAtt = array[i];
            CGRect frame = currentAtt.frame;
            frame = CGRectMake(self.sectionInset.left, frame.origin.y, frame.size.width, frame.size.height);
            currentAtt.frame = frame;
        }
    }
    return array;
}

cell里代码使用的是masonry布局，不多做解释

- (instancetype)initWithFrame:(CGRect)frame{
    
    if (self = [super initWithFrame:frame]){
        [self initViews];
    }
    return self;
}

- (void)initViews{
    self.contentView.backgroundColor = backColor;
    [self.contentView addSubview:self.desLabel];
    
    self.layer.cornerRadius = 15;
    self.layer.masksToBounds = true;
    
    [self.desLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.mas_equalTo(self.contentView);
        make.left.mas_equalTo(self.contentView).offset(10);
        make.right.mas_equalTo(self.contentView).offset(-10);
        make.width.lessThanOrEqualTo(@(kScreenWidth - 40));
        make.width.greaterThanOrEqualTo(@45);
    }];
}

- (UILabel *)desLabel{
    if (!_desLabel) {
        _desLabel = [[UILabel alloc]init];
        _desLabel.font = XTMFont(14);
        _desLabel.textColor = rgb(89, 89, 89);
        _desLabel.textAlignment = NSTextAlignmentCenter;
    }
    return _desLabel;
}

collectionView里面estimatedItemSize随便给个值就好

layout.estimatedItemSize = CGSizeMake(100, 30);

效果如图：

151569551540_.pic.jpg

demo有时间写一个上传