Maonry 动态多个按钮布局，横向及纵向

 1     self.itemArray = [NSMutableArray array];
 2     for (NSInteger i=0; i < 6; i++) {
 3         UIButton *button = [[UIButton alloc] init];
 4         button.backgroundColor = [UIColor greenColor];
 5         UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonTapPressed:)];
 6         [button addGestureRecognizer:tapGesture];
 7         [self.view addSubview:button];
 8         [self.itemArray addObject:button];
 9     }
10     
11     [self.itemArray mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:15 leadSpacing:10 tailSpacing:10];
12     [self.itemArray mas_makeConstraints:^(MASConstraintMaker *make) {
13         make.top.equalTo(self.view).offset(100);
14         make.height.equalTo(@50);
15     }];