该控件为自定义的实现瀑布流效果的控件，功能较为简单，并提供自定义delegate以供使用 功能会一步步完善起来 注意内存问题：不显示的image设成nil

控件分为.h 和 .m文件

效果图

控件分为3列来显示

1. .h文件包含协议声明和控件声明

@protocol UIPhotosViewDelegate <NSObject>     // 当点击某个图片时，返回该图片所在的UIImageView,参数即返回的imageview  - (void)clickedWithView:(UIImageView *)view;     @end        @interface UIPhotosView : UIView <UIPhotosViewDelegate> {         }     @property (nonatomic, assign) id<UIPhotosViewDelegate> delegate;  // 自定义协议     @property (nonatomic, retain) UIView *leftView;                   // 左侧视图框  @property (nonatomic, retain) UIView *midView;                    // 中间视图框  @property (nonatomic, retain) UIView *rightView;                  // 右侧视图框     @property (nonatomic, assign) CGFloat subWidth;                   // 视图框的宽度，即1/3     - (void)addImage:(UIImage *)image;                                // 向控件加入一张图片     @end

2. .m文件包含控件实现

@implementation UIPhotosView     // 初始化  - (id)initWithFrame:(CGRect)frame {      self = [super initWithFrame:frame];      if (self) {          _subWidth = frame.size.width / 3.0;                     _leftView = [[UIView alloc] init];          _leftView.frame = CGRectMake(0, 0, _subWidth, 1);          [self addSubview:_leftView];                     _midView = [[UIView alloc] init];          _midView.frame = CGRectMake(_subWidth, 0, _subWidth, 1);          [self addSubview:_midView];                     _rightView = [[UIView alloc] init];          _rightView.frame = CGRectMake(_subWidth*2, 0, _subWidth, 1);          [self addSubview:_rightView];      }      return self;  }     // 加入图片  - (void)addImage:(UIImage *)image {      CGFloat leftHeight = _leftView.frame.size.height;      CGFloat midHeight = _midView.frame.size.height;      CGFloat rightHeight = _rightView.frame.size.height;             UIImageView *view = [self createImageView:image];  // 创建imageview             CGFloat wid = _subWidth;      CGFloat hei = image.size.height / (image.size.width / _subWidth);             // 判断加入最短的view内      if (leftHeight <= midHeight && leftHeight <= rightHeight) {          [_leftView addSubview:view];          view.frame = CGRectMake(0, leftHeight, wid, hei);          leftHeight = leftHeight + hei;          _leftView.frame = CGRectMake(0, 0, wid, leftHeight);      }      else if (midHeight <= rightHeight) {          [_midView addSubview:view];          view.frame = CGRectMake(0, midHeight, wid, hei);          midHeight = midHeight + hei;          _midView.frame = CGRectMake(_subWidth, 0, wid, midHeight);      }      else {          [_rightView addSubview:view];          view.frame = CGRectMake(0, rightHeight, wid, hei);          rightHeight = rightHeight + hei;          _rightView.frame = CGRectMake(_subWidth*2, 0, wid, rightHeight);      }             // 调整当前控件的frame      CGFloat maxnum = [self max:leftHeight and:midHeight and:rightHeight];      self.frame = CGRectMake(0, 0, self.frame.size.width, maxnum);  }     // 创建imageview   并绑定事件  - (UIImageView *)createImageView:(UIImage *)image {      UIImageView *view = [[UIImageView alloc] initWithImage:image];      view.layer.borderWidth = 1.0;      view.layer.borderColor = [UIColor redColor].CGColor;             view.userInteractionEnabled = YES;      UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] init];      [recognizer addTarget:self action:@selector(handleClicked:)];      [view addGestureRecognizer:recognizer];             return view;  }     // 点击view时获取imageview，传给delegate  - (void)handleClicked:(UITapGestureRecognizer *)recognizer {      UIImageView *view = recognizer.view;      [self.delegate clickedWithView:view];  }     - (CGFloat)max:(CGFloat)n1 and:(CGFloat)n2 and:(CGFloat)n3 {      CGFloat maxnum = n1 > n2 ? n1 : n2;      maxnum = maxnum > n3 ? maxnum : n3;      return maxnum;  }     @end