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#define kWidth self.frame.size.width
#define kHeight self.frame.size.height
@interface JRScrollView()
@property (nonatomic, strong) NSMutableArray * frameArray;
@property (nonatomic, strong) NSMutableDictionary * temDic;
@property (nonatomic, strong) NSMutableSet * temSet;
@property (nonatomic, strong) NSMutableDictionary * inDic;
@end
@implementation JRScrollView
//懒加载
- (NSMutableArray *)frameArray
{
if (_frameArray == nil)
{
_frameArray = [NSMutableArray array];
}
return _frameArray;
}
- (NSMutableDictionary *)temDic
{
if (_temDic == nil)
{
_temDic = [NSMutableDictionary dictionary];
}
return _temDic;
}
- (NSMutableSet *)temSet
{
if (_temSet == nil)
{
_temSet = [NSMutableSet set];
}
return _temSet;
}
- (NSMutableDictionary *)inDic
{
if (_inDic == nil)
{
_inDic = [NSMutableDictionary dictionary];
}
return _inDic;
}
//初始化
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame])
{
self.showsVerticalScrollIndicator = NO;
self.backgroundColor = [UIColor whiteColor];
}
return self;
}
//加载数据
- (void)loadDataWithArray:(NSMutableArray *)array
{
//获得列数
NSInteger colums = 3;
if ([self.delegateMe respondsToSelector:@selector(numberOfColums:)])
{
colums = [self.delegateMe numberOfColums:self];
}
//获取cell数
NSInteger count = 0;
if ([self.dataSourceMe respondsToSelector:@selector(numberOfCell:)])
{
count = [self.dataSourceMe numberOfCell:self];
}
//计算左右间距
CGFloat marginLR = 10;
//计算上下间距
CGFloat marginUD = marginLR;
//计算cell宽度
CGFloat cellW = (kWidth-marginLR*(colums+1))/colums;
//标记每一列的做大Y值
NSMutableArray * maxYAry = [NSMutableArray array];
for (int i = 0; i<colums; i++)
{
NSMutableDictionary * dic = [NSMutableDictionary dictionary];
[dic setObject:@(0) forKey:@"maxY"];
//计算放在这一列的x坐标
CGFloat cellX = (cellW+marginLR)*i+marginLR;
[dic setObject:@(cellX) forKey:@"cellX"];
//添加数组
[maxYAry addObject:dic];
}
//计算高度和坐标
for (int i = 0; i<count; i++)
{
JRCellModel * model = array[i];
//计算cell高度
CGFloat cellH = model.h*cellW/model.w;
//获取maxY最小的一列
[maxYAry sortUsingComparator:^NSComparisonResult(id obj1, id obj2)
{
return [obj1[@"maxY"] doubleValue] - [obj2[@"maxY"] doubleValue];
}];
NSMutableDictionary * dic = [maxYAry firstObject];
//cell放在那一列（x值）
CGFloat cellX = [dic[@"cellX"] doubleValue];
//cell的y值
CGFloat cellY = [dic[@"maxY"] intValue] + marginUD;
//更新这个字典的属性
CGFloat tempY = cellY+cellH;
[dic setObject:@(tempY) forKey:@"maxY"];
//创建frame，加入数组
CGRect frame = CGRectMake(cellX, cellY, cellW, cellH);
[self.frameArray addObject:[NSValue valueWithCGRect:frame]];
//计算contentsize
if (i == count - 1) self.contentSize = CGSizeMake(kWidth, tempY+marginUD);
}
//布局
- (void)layoutSubviews
{
[super layoutSubviews];
//判断frame在不在视野中
BOOL isIn;
for (int i = 0; i<self.frameArray.count; i++)
{
CGRect frame = [self.frameArray[i] CGRectValue];
CGFloat offsetY = self.contentOffset.y;
isIn = offsetY<CGRectGetMaxY(frame) && (offsetY+self.frame.size.height)>CGRectGetMinY(frame);
//在，新添加的（原来有的不处理）
if(isIn)
{
if(!self.inDic[@(i)])
{
//添加新的视图
JRCell * cell = [self.dataSourceMe scroll:self cellAtIndex:i];
cell.frame = [self.frameArray[i] CGRectValue];
[self addSubview:cell];
//处理inDic字典
[self.inDic setObject:cell forKey:@(i)];
}
}
//不在，新删除的（一直不在的不处理）
else
{
JRCell * cell = self.inDic[@(i)];
if(cell)
{
NSMutableSet * set = self.temDic[cell.reuseableID];
[set addObject:cell];
[self.inDic removeObjectForKey:@(i)];
[cell removeFromSuperview];
}
}
}
}
//重复利用
- (JRCell *)dequWithReusedableID:(NSString *)ID
{
NSMutableSet * set = self.temDic[ID];
if (!set)
{
set = [NSMutableSet set];
[self.temDic setObject:set forKey:ID];
}
// NSLog(@"%li", set.count);
JRCell * cell = [set anyObject];
if (cell)
{
[set removeObject:cell];
}
return cell;
}
@end