多個（2個以上）控制元件的等間隔排序顯示
首先介紹2個函式
/**
     *  axisType         軸線方向
     *  fixedSpacing     間隔大小
     *  fixedItemLength  每個控制元件的固定長度/寬度
     *  leadSpacing      頭部間隔
     *  tailSpacing      尾部間隔
     *
     */
//1. 等間隔排列 - 多個控制元件間隔固定，控制元件長度/寬度變化
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType
withFixedSpacing:(CGFloat)fixedSpacing leadSpacing:(CGFloat)leadSpacing
tailSpacing:(CGFloat)tailSpacing;

//2. 等間隔排列 - 多個固定大小固定，間隔空隙變化
- (void)mas_distributeViewsAlongAxis:(MASAxisType)axisType
withFixedItemLength:(CGFloat)fixedItemLength
leadSpacing:(CGFloat)leadSpacing
tailSpacing:(CGFloat)tailSpacing;

//首先新增5個檢視
 NSMutableArray *array = [NSMutableArray new];
    for (int i = 0; i < 5; i ++) {
        UIView *view = [UIView new];
        view.backgroundColor = [UIColor greenColor];
        [self addSubview:view];
        [array addObject:view]; //儲存新增的控制元件
    }

//水平方向控制元件間隔固定等間隔
[array mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:15 leadSpacing:10 tailSpacing:10];
            [array makeConstraints:^(MASConstraintMaker *make) {
                make.top.equalTo(50);
                make.height.equalTo(70);
            }];

//水平方向寬度固定等間隔
[array mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedItemLength:70 leadSpacing:10 tailSpacing:10];
            [array makeConstraints:^(MASConstraintMaker *make) { //陣列額你不必須都是view 
                make.top.equalTo(50);
                make.height.equalTo(70);
            }];