Masnory 使用

来源：互联网发布：空间大师软件编辑：程序博客网时间：2024/05/29 19:16

Masonry是一个轻量级的自动布局库，采用独特的链式语法进行代码封装，具有高可用性和阅读性等特点， 下面来说一下几个实用的例子！

设置类似下图的布局约束

//设置一组button的约束- (void)masonryArrayWithButton{NSArray *titleArray = @[@"按钮1", @"按钮2", @"按钮3", @"按钮4"];NSMutableArray *mArray = [NSMutableArray array];for (NSInteger i = 0; i < titleArray.count; i++) {UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];[button setTitle:titleArray[i] forState:UIControlStateNormal];[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];button.layer.borderColor = [UIColor blackColor].CGColor;button.layer.borderWidth = 2;[self.view addSubview:button];[mArray addObject:button];}[mArray mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:20 leadSpacing:20 tailSpacing:20];[mArray mas_makeConstraints:^(MASConstraintMaker *make) {make.top.equalTo(@100);make.height.equalTo(@40);}];}

2 . 不设置宽高，会自动适应

这里写图片描述

//不设置UILabel宽跟高的值-(void)masonryLabelHeightLayout{    //文本控件UILabel、按钮UIButton、图片视图UIImageView等，它们具有自身内容尺寸（Intrinsic Content Size），此类用户控件会根据自身内容尺寸添加布局约束。也就是说，如果开发者没有显式给出其宽度或者高度约束，则其自动添加的自身内容约束将会起作用。因此看似“缺失”约束，实际上并非如此    UILabel *myLabel=[[UILabel alloc]init];    myLabel.backgroundColor=[UIColor redColor];    myLabel.text=@"A测试Label不设高度时它的默认值测试Label不设高度时它的默认值";    myLabel.numberOfLines = 0;    [self.view addSubview:myLabel];    [myLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(150);        make.left.mas_equalTo(20);        make.right.mas_equalTo(-60);    }];    UILabel *mySecondLabel=[[UILabel alloc]init];    mySecondLabel.backgroundColor=[UIColor blueColor];    mySecondLabel.text=@"确认";    [self.view addSubview:mySecondLabel];    [mySecondLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.mas_equalTo(myLabel.mas_right).offset(10);        make.centerY.mas_equalTo(myLabel);    }];}

3 . 适用于一行多个控件设定一个为优先级问题

这里写图片描述

//优先级 及至少的情况-(void)masonryPriorityLayout{    UILabel *myLabel=[[UILabel alloc]init];    myLabel.backgroundColor=[UIColor redColor];    myLabel.text=@"B1测试Label不设高度时它的默认值,再增加文字长度时的情况";    myLabel.numberOfLines = 0;    [self.view addSubview:myLabel];    [myLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(200);        make.left.mas_equalTo(20);        //至少至右边有80的空间，优先级设高，如果文字不够长 它会以文字本来的宽度        make.right.mas_lessThanOrEqualTo(-80).with.priorityHigh();    }];    UILabel *mySecondLabel=[[UILabel alloc]init];    mySecondLabel.backgroundColor=[UIColor blueColor];    mySecondLabel.text=@"确认";    [self.view addSubview:mySecondLabel];    [mySecondLabel mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(myLabel);        make.left.mas_equalTo(myLabel.mas_right).offset(10);    }];}

4 . 为滚动视图添加约束

这里写图片描述

//滚动视图添加约束-(void)masonryScrollViewLayout{    UIScrollView *scrollView = [UIScrollView new];    scrollView.backgroundColor = [UIColor whiteColor];    [self.view addSubview:scrollView];    [scrollView mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.mas_equalTo(280);        make.size.mas_equalTo(CGSizeMake(350,200));        make.centerX.mas_equalTo(self.view);    }];    UIView *container = [UIView new];    [scrollView addSubview:container];    [container mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(scrollView);        make.width.equalTo(scrollView);    }];    int count = 15;    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.left.and.right.equalTo(container);            make.height.mas_equalTo(@(30));            if ( lastView )            {                make.top.mas_equalTo(lastView.mas_bottom);            }            else            {                make.top.mas_equalTo(container.mas_top);            }        }];        lastView = subv;    }    //container这个view起到了一个中间层的作用 能够自动的计算uiscrollView的contentSize 下面这句很关键    [container mas_makeConstraints:^(MASConstraintMaker *make) {        make.bottom.equalTo(lastView.mas_bottom);    }];}

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