iOS8以後，UIView多了一個新的屬性：

@property (nonatomic) UIEdgeInsets layoutMargins NS_AVAILABLE_IOS(8_0);

本例就是對該屬性的使用。
效果圖：

程式碼：

- (instancetype)init {
    self = [super init];
    if (!self) return nil;

    UIView *lastView = self;
    for (int i = 0; i < 10; i++) {
        UIView *view = UIView.new
 
;
        view.backgroundColor = [self randomColor];
        view.layer.borderColor = UIColor.blackColor.CGColor;
        view.layer.borderWidth = 2;
        view.layoutMargins = UIEdgeInsetsMake(5, 10, 15, 20);
        [self addSubview:view];

        [view mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top
 
.equalTo(lastView.topMargin);
            make.bottom.equalTo(lastView.bottomMargin);
            make.left.equalTo(lastView.leftMargin);
            make.right.equalTo(lastView.rightMargin);
        }];

        lastView = view;
    }

    return self;
}

- (UIColor *)randomColor {
    CGFloat hue = ( arc4random() % 256
 
 / 256.0 );  //  0.0 to 1.0
    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
}

個人理解：layoutMargins屬性就是用於佈局的檢視之間的一個參照資料。該屬性與Masonry結合，簡化了自動佈局的程式碼和語義。