废话不说先来张图,无图无真相 QQ20180808-111724-HD.gif

代码实现如下:

#import <UIKit/UIKit.h>

@interface LLButttonsView : UIView
///本次需要添加宫格的个数
@property(nonatomic ,assign)NSInteger buttonCount;
///传入宫格最大个数
- (instancetype)initWithFrame:(CGRect)frame maxButtonsCount:(NSInteger)maxButtonsCount;
@end

#import "LLButttonsView.h"
#import <Masonry/Masonry.h>
@interface LLButttonsView()
///装多宫格的数组,复用视图
@property(nonatomic ,strong)NSMutableArray <UIButton*>* buttons;
///容器视图 来自适应九宫格高度
@property(nonatomic ,strong)UIView * containerView;
///容器视图的底部约束
@property(nonatomic ,weak)MASConstraint * containerViewConstraintbottom;
@end

@implementation LLButttonsView

-(void)setButtonCount:(NSInteger)buttonCount {
    _buttonCount = buttonCount;
//每次重新创建宫格的个数 从容器视图中移除
    [self.containerView.subviews enumerateObjectsUsingBlock:^(UIButton * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (!obj.hidden) {
            [obj removeFromSuperview];
            obj.hidden = true;
        }
    }];
 ///循环从初始化list中取出在添加到容器视图当中
    for (int i = 0; i< buttonCount; i++) {
        UIButton * btn = self.buttons[i];
         [self.containerView addSubview:btn];
        btn.hidden = false;
    }
    CGFloat gridWidth = 80;//格子的宽度
    CGFloat gridHeight = 30;//格子的高度
    NSInteger rowNumber = 3;//每行几个
    //间距x,y
    CGFloat marginX = ([UIScreen mainScreen].bounds.size.width - gridWidth * rowNumber) / (rowNumber + 1);
    CGFloat marginY = 20;
    
    for ( int  i = 0; i < self.containerView.subviews.count ; i++) {
        UIButton *subv = self.containerView.subviews[i];
        subv.backgroundColor = [UIColor colorWithHue:( arc4random() % 256 / 256.0 )
                                          saturation:( arc4random() % 128 / 256.0 ) + 0.5
                                          brightness:( arc4random() % 128 / 256.0 ) + 0.5
                                               alpha:1];
        
        [subv mas_makeConstraints:^(MASConstraintMaker *make){
            make.left.mas_equalTo(marginX + i % rowNumber * (gridWidth + marginX));
            make.top.mas_equalTo(marginY + i / rowNumber * (gridHeight + marginY));
            make.width.mas_equalTo(gridWidth);
            make.height.mas_equalTo(gridHeight);
        }];
    }
//卸载上一次容器视图的底部约束
    if (self.containerViewConstraintbottom) {
        [self.containerViewConstraintbottom uninstall];
    }
//重新生成容器视图的底部约束 参考最后一个宫格的底部
    [self.containerView mas_makeConstraints:^(MASConstraintMaker *make) {
       self.containerViewConstraintbottom = make.bottom.equalTo(self.containerView.subviews.lastObject).offset(10);
    }];
    [self mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(self.containerView.mas_bottom);
    }];
}
- (instancetype)initWithFrame:(CGRect)frame maxButtonsCount:(NSInteger)maxButtonsCount
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor redColor];
        for (int i = 0; i< maxButtonsCount; i++) {
            UIButton * button = [UIButton new];
            button.hidden = true;
            [self.buttons addObject:button];
        }
        [self addSubview:self.containerView];
        [self.containerView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.top.right.equalTo(self);
           //.conself.containerViewConstraintHeight =  make.height.mas_equalTo(0);
        }];
    }
    return self;
}

/// MARK: ---- 懒加载
-(NSMutableArray *)buttons {
    if (!_buttons) {
        _buttons = [NSMutableArray array];
    }
    return _buttons;
}
-(UIView *)containerView {
    if (!_containerView) {
        _containerView = [UIView new];
    }
    return _containerView;
}
@end

具体使用 如下:

 LLButttonsView * buttonView = [[LLButttonsView alloc] initWithFrame:CGRectZero maxButtonsCount:100];
    _buttonView = buttonView;
    [self.view addSubview:buttonView];
//此处不用约束高度 ,已经在内部实现.只需要约束上下右即可
    [buttonView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.top.equalTo(self.view);
    }];
    buttonView.buttonCount = 9;
    
    UILabel * textLable = [UILabel new];
    textLable.numberOfLines = 0;
    [self.view addSubview:textLable];
    textLable.text = @"arc4random() 是一个真正的伪随机算法，不需要生成随机种子，因为第一次调用的时候就会自动生成。而且范围是rand()的两倍。在iPhone中，RAND_MAX是0x7fffffff (2147483647)，而arc4random()返回的最大值则是 0x100000000 (4294967296)。作者：iOS_成才录链接：https://www.jianshu.com/p/f3f26608d1dd來源：简书简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。";
    textLable.textColor = [UIColor darkGrayColor];
    [textLable mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.top.equalTo(buttonView.mas_bottom);
    }];
# 模拟网络请求后调整宫格的个数
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    
    self.buttonView.buttonCount = arc4random() % 10+1;
}