iOS自定义瀑布流

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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

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总结

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