Masonry使用详解

mas_makeConstraints 只负责新增约束 Autolayout不能同时存在两条针对于同一对象的约束否则会报错
mas_updateConstraints 针对上面的情况会更新在block中出现的约束不会导致出现两个相同约束的情况
mas_remakeConstraints 则会清除之前的所有约束仅保留最新的约束
equalTo 和 mas_equalTo的区别在哪里呢? 其实 mas_equalTo是一个MACRO,比较的是值，equalTo比较的是view。

宽高相等：

make.width.offset(marginHeight);

make.height.mas_equalTo(timeImg.mas_width).multipliedBy(1);

1. [基础] 居中显示一个view

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view.

WS(ws);

UIView *sv = [UIView new];

[sv showPlaceHolder];

sv.backgroundColor = [UIColor blackColor];

[self.view addSubview:sv];

[sv mas_makeConstraints:^(MASConstraintMaker *make) {

make.center.equalTo(ws.view);

make.size.mas_equalTo(CGSizeMake(300, 300));

}];

}

2. [初级] 让一个view略小于其superView(边距为10)

UIView *sv1 = [UIView new];

[sv1 showPlaceHolder];

sv1.backgroundColor = [UIColor redColor];

[sv addSubview:sv1];

[sv1 mas_makeConstraints:^(MASConstraintMaker *make) {

make.edges.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));

/* 等价于

make.top.equalTo(sv).with.offset(10);

make.left.equalTo(sv).with.offset(10);

make.bottom.equalTo(sv).with.offset(-10);

make.right.equalTo(sv).with.offset(-10);

*/

/* 也等价于

make.top.left.bottom.and.right.equalTo(sv).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));

*/

}];

3. [初级] 让两个高度为150的view垂直居中且等宽且等间隔排列间隔为10(自动计算其宽度)

int padding1 = 10;

[sv2 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.mas_equalTo(sv.mas_centerY);

make.left.equalTo(sv.mas_left).with.offset(padding1);

make.right.equalTo(sv3.mas_left).with.offset(-padding1);

make.height.mas_equalTo(@150);

make.width.equalTo(sv3);

}];

[sv3 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.mas_equalTo(sv.mas_centerY);

make.left.equalTo(sv2.mas_right).with.offset(padding1);

make.right.equalTo(sv.mas_right).with.offset(-padding1);

make.height.mas_equalTo(@150);

make.width.equalTo(sv2);

}];

4. [中级] 在UIScrollView顺序排列一些view并自动计算contentSize

    UIScrollView *contextSV = [UIScrollView new];
    contextSV.backgroundColor = [UIColor greenColor];
    contextSV.pagingEnabled = YES;
    [self.view addSubview:contextSV];
    [contextSV mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.offset(0);
        make.right.offset(0);
        make.top.offset(0);
        make.bottom.offset(-49.0f);
    }];

    UIView *contentView = [UIView new];
    [contextSV addSubview:contentView];
    [contentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.offset(0);
        make.right.offset(0);
        make.top.offset(0);
        make.bottom.offset(0);
        make.height.equalTo(contextSV.mas_height);
    }];

    UIView *nextView = nil;
    for (int i = 0 ; i < 10; i++)
    {
        UIView *view = [UIView new];
        view.backgroundColor = [UIColor colorWithRed:(arc4random()%256/255.0f) green:(arc4random()%256/255) blue:(arc4random()%256/255) alpha:1];
        [contentView addSubview:view];
        [view mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.offset(0);
            make.bottom.offset(0);
            if (i == 0) {
                make.left.offset(0);
            }else{
                make.left.equalTo(nextView.mas_right).offset(0);
            }
            if (i == 9) {
                make.right.offset(0);
            }
            make.width.equalTo(contextSV.mas_width);
        }];
        nextView = view;
    }
    [contentView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(nextView.mas_right);
    }];

5. [高级] 横向或者纵向等间隙的排列一组view

@implementation UIView(Masonry_LJC)

- (void) distributeSpacingHorizontallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(ws.mas_left);

make.centerY.equalTo(((UIView*)views[0]).mas_centerY);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(lastSpace.mas_right);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(obj.mas_right);

make.centerY.equalTo(obj.mas_centerY);

make.width.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.right.equalTo(ws.mas_right);

}];

}

- (void) distributeSpacingVerticallyWith:(NSArray*)views

{

NSMutableArray *spaces = [NSMutableArray arrayWithCapacity:views.count+1];

for ( int i = 0 ; i < views.count+1 ; ++i )

{

UIView *v = [UIView new];

[spaces addObject:v];

[self addSubview:v];

[v mas_makeConstraints:^(MASConstraintMaker *make) {

make.width.equalTo(v.mas_height);

}];

}

UIView *v0 = spaces[0];

__weak __typeof(&*self)ws = self;

[v0 mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(ws.mas_top);

make.centerX.equalTo(((UIView*)views[0]).mas_centerX);

}];

UIView *lastSpace = v0;

for ( int i = 0 ; i < views.count; ++i )

{

UIView *obj = views[i];

UIView *space = spaces[i+1];

[obj mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(lastSpace.mas_bottom);

}];

[space mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(obj.mas_bottom);

make.centerX.equalTo(obj.mas_centerX);

make.height.equalTo(v0);

}];

lastSpace = space;

}

[lastSpace mas_makeConstraints:^(MASConstraintMaker *make) {

make.bottom.equalTo(ws.mas_bottom);

}];

}

@end

UIView *sv11 = [UIView new];

UIView *sv12 = [UIView new];

UIView *sv13 = [UIView new];

UIView *sv21 = [UIView new];

UIView *sv31 = [UIView new];

sv11.backgroundColor = [UIColor redColor];

sv12.backgroundColor = [UIColor redColor];

sv13.backgroundColor = [UIColor redColor];

sv21.backgroundColor = [UIColor redColor];

sv31.backgroundColor = [UIColor redColor];

[sv addSubview:sv11];

[sv addSubview:sv12];

[sv addSubview:sv13];

[sv addSubview:sv21];

[sv addSubview:sv31];

//给予不同的大小测试效果

[sv11 mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.equalTo(@[sv12,sv13]);

make.centerX.equalTo(@[sv21,sv31]);

make.size.mas_equalTo(CGSizeMake(40, 40));

}];

[sv12 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(70, 20));

}];

[sv13 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(50, 50));

}];

[sv21 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(50, 20));

}];

[sv31 mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(40, 60));

}];

[sv distributeSpacingHorizontallyWith:@[sv11,sv12,sv13]];

[sv distributeSpacingVerticallyWith:@[sv11,sv21,sv31]];

[sv showPlaceHolderWithAllSubviews];

[sv hidePlaceHolder];

使用masonary就行九宫格布局:

-(void)viewDidLoad{
    _topScrollButtonTitleArr=[[NSMutableArray alloc] initWithObjects:@"推荐", @"青春", @"淑女", @"女鞋", @"配饰", @"女包", @"泳装", @"内衣", @"婚礼", @"大码", @"老公" ,@"妈妈", @"爸爸", @"孕妇", @"男孩", @"女孩", @"生活", nil];


    __block MainChoseLabel *nextLabel=nil;
    for (int i=0;i<_topScrollButtonTitleArr.count;i++) {
        MainChoseLabel *mainLabel=[MainChoseLabel new];
        [self.view addSubview:mainLabel];
        mainLabel.backgroundColor=[UIColor redColor];
        mainLabel.text=_topScrollButtonTitleArr[i];
        int col=i%4;
        [mainLabel mas_updateConstraints:^(MASConstraintMaker *make) {
            if(nextLabel){
                if(col==0){
                    make.left.offset(10);
                }else{

                    make.left.equalTo(nextLabel.mas_right).offset(10);
                }
                 make.width.equalTo(nextLabel);

                if(((i+1)%4)==0){
                    make.right.offset(-10);
                    NSLog(@"---");
                }
            }else{
                make.left.offset(10);
            }


            make.height.offset(44);
            make.top.offset((10+44)*(i/4)+30);

        }];

        nextLabel=mainLabel;
    }
}

mas scrollview布局

_bigScrollView=[UIScrollView new];
    _bigScrollView.pagingEnabled=YES;
    _bigScrollView.delegate=self;
    [self.view addSubview:_bigScrollView];

    [_bigScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(120,5,5,5));
        make.top.top.offset(0);
        make.bottom.offset(0);
        make.left.offset(0);
        make.right.offset(0);
    }];
    _bigScrollView.backgroundColor=[UIColor redColor];
    UIView *container = [UIView new];
    [_bigScrollView addSubview:container];
    container.backgroundColor=[UIColor redColor];
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(_bigScrollView);
        make.height.equalTo(_bigScrollView);
    }];

int count = 10;
    UIView *lastView = nil;
    for ( int i = 1 ; i <= count ; ++i )
    {
        UIView *subv = [UIView new];
        [container addSubview:subv];

        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.top.and.bottom.equalTo(container);
            make.width.mas_equalTo(_bigScrollView);
            if (lastView)
            {
                make.left.mas_equalTo(lastView.mas_right);
            }
            else
            {
                make.left.mas_equalTo(container.mas_left);
            }
        }];

        lastView = subv;
    }
    [container mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(lastView.mas_right);
    }];

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Masonry使用详解

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