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首先，在正式使用Masonry之前,我们先来看看在xib中我们是如何使用AutoLayout





从图中我们可以看出,只要设置相应得局限，控制好父视图与子视图之间的关系就应该很ok的拖出你需要的需求。这里就不详细讲解具体拖拽的方法…..

然后,我们按着上图的属性来看看如何简单得使用Masonry

这里是Masonry给我们的属性

@property (nonatomic, strong, readonly) MASConstraint *left; //左侧

@property (nonatomic, strong, readonly) MASConstraint *top; //上侧

@property (nonatomic, strong, readonly) MASConstraint *right; //右侧

@property (nonatomic, strong, readonly) MASConstraint *bottom; //下侧

@property (nonatomic, strong, readonly) MASConstraint *leading; //首部

@property (nonatomic, strong, readonly) MASConstraint *trailing; //尾部

@property (nonatomic, strong, readonly) MASConstraint *width; //宽

@property (nonatomic, strong, readonly) MASConstraint *height; //高

@property (nonatomic, strong, readonly) MASConstraint *centerX; //横向居中

@property (nonatomic, strong, readonly) MASConstraint *centerY; //纵向居中

@property (nonatomic, strong, readonly) MASConstraint *baseline; //文本基线

属性有了,接着我们应该怎么在视图中添加约束呢，Masonry给我们提供了3个方法

//新增约束

- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *make))block;

//更新约束

- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *make))block;

//清楚之前的所有约束,只会保留最新的约束

- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;

合理的利用这个3个函数，基本上可以应对任何情况了

准备工作已经完成，我们来看几个小demo

1.居中一个view

// 防止block中的循环引用
__weak typeof (self) weakSelf = self;
// 初始化一个View
UIView *bgView = [[UIView alloc]init];
bgView.backgroundColor = [UIColor redColor];
[self.view addSubview:bgView];
// 使用mas_makeConstraints添加约束
[bgView mas_makeConstraints:^(MASConstraintMaker *make) {
make.center.equalTo(weakSelf.view);
make.size.mas_equalTo(CGSizeMake(200, 200));
}]；

效果图1

是不是很简单，这里有一点要必须注意下，添加约束前必须要把view添加到视图上。

那我要是不想固定他得宽高呢，让view的大小根据间距来控制怎么做

我们来设置一个基于父视图间距为10的view

[bgView mas_makeConstraints:^(MASConstraintMaker *make) {

make.center.equalTo(weakSelf.view);

make.edges.mas_offset(UIEdgeInsetsMake(10, 10, 10, 10));

}]；

这样就ok了！！！

make.edges.mas_offset(UIEdgeInsetsMake(10, 10, 10, 10));

等同于

make.top.equalTo(weakSelf.view).with.offset(10);
make.left.equalTo(weakSelf.view).with.offset(10);
make.bottom.equalTo(weakSelf.view).with.offset(-10);
make.right.equalTo(weakSelf.view).with.offset(-10);

2.多个view

2个view横向居中，第二个view距离第一个view间距为10

UIView *view1 = [[UIButton alloc]init];
view1.backgroundColor = [UIColor redColor];
[self.view addSubview:view1];
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(90, 90));
make.centerX.equalTo(weakSelf.view);
make.top.width.offset(90);
}];

UIView *view2 = [[UILabel alloc]init];
view2.backgroundColor = [UIColor yellowColor];
[self.view addSubview:view2];
[view2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(100, 100));
make.centerX.equalTo(view1);
make.top.equalTo(view1.mas_bottom).with.offset(20);
}];

效果图2

大家有没有看到第二个view代码中

make.top.equalTo(view1.mas_bottom).with.offset(20);

view1.mas_bottom 是什么意思呢？如果只写view1，Masonry会默认是view1中最上面开始算起，也就是view2 间距view1 Y轴开始20的间距

通过这个也就可以很方便的设置view同另一个view之间上下左右的间距了

大家不妨试试view.mas_top view.mas_left view.mas_right 的效果是什么样得了

下面我附上一个完整的界面demo,大家可以看看



效果图3

代码如下：

(void)setupFrame {

__weak typeof(self) weakSelf = self;

//上传头像

UIButton *iconBtn = [[UIButton alloc]init];

[iconBtn setCornerRadius:45];

[iconBtn setBackgroundImage:[UIImage imageNamed:@”huantouxiang”] forState:UIControlStateNormal];

[iconBtn addTarget:self action:@selector(iconButton) forControlEvents:UIControlEventTouchDown];

[self.view addSubview:iconBtn];

self.iconBtn = iconBtn;

[self.iconBtn mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(90, 90));

make.centerX.equalTo(weakSelf.view);

make.top.width.offset(90);

}];

//上传社区头像文字提醒

UILabel *iconLabel = [[UILabel alloc]init];

iconLabel.textColor = c3;

iconLabel.text = @”上传社团头像”;

iconLabel.font = [UIFont systemFontOfSize:15];

[self.view addSubview:iconLabel];

[iconLabel mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerX.equalTo(iconBtn);

make.top.equalTo(iconBtn.mas_bottom).with.offset(20);

}];

//社团编辑图标

UIImageView *editIcon = [[UIImageView alloc]init];

editIcon.image = [UIImage imageNamed:@”bianxie”];

[self.view addSubview:editIcon];

[editIcon mas_makeConstraints:^(MASConstraintMaker *make) {

make.size.mas_equalTo(CGSizeMake(25, 20));

make.left.equalTo(weakSelf.view).with.offset(10);

make.top.equalTo(iconLabel.mas_bottom).with.offset(30);

}];

//社团名

UITextField *nameText = [[UITextField alloc]init];

nameText.placeholder = @”请填写社区名(社团名最多6个字)”;

[self.view addSubview:nameText];

self.nameText = nameText;

[nameText mas_makeConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(@20);

make.centerY.equalTo(editIcon);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.left.equalTo(editIcon.mas_right).with.offset(5);

}];

//分割线

UIImageView *xian = [[UIImageView alloc]init];

xian.backgroundColor = DBColor(226, 226, 226);

[self.view addSubview:xian];

[xian mas_makeConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(@1);

make.left.equalTo(weakSelf.view).with.offset(10);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.top.equalTo(editIcon.mas_bottom).with.offset(5);

}];

//选择标签

UILabel *tagLabel = [[UILabel alloc]init];

tagLabel.text = @”选择标签”;

tagLabel.textColor = c3;

tagLabel.font = [UIFont systemFontOfSize:15];

[self.view addSubview:tagLabel];

[tagLabel mas_makeConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(@20);

make.width.mas_equalTo(@60);

make.left.equalTo(weakSelf.view).with.offset(10);

make.top.equalTo(xian).with.offset(35);

}];

//跳转标签选择

UITextField *tagText = [[UITextField alloc]init];

tagText.placeholder = @”美容颜”;

tagText.borderStyle=UITextBorderStyleRoundedRect;

tagText.delegate = self;

[tagText addTarget:self action:@selector(textTag) forControlEvents:UIControlEventTouchDown];

[self.view addSubview:tagText];

[tagText mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerY.equalTo(tagLabel);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.left.equalTo(tagLabel.mas_right).with.offset(5);

}];

//tagView

self.tagView = ({

SKTagView *view = [SKTagView new];

view.backgroundColor = [UIColor clearColor];

view.padding = UIEdgeInsetsMake(0, 0, 0, 0);

view.insets = 15;

view.lineSpace = 10;

__weak SKTagView *weakView = view;

view.didClickTagAtIndex = ^(NSUInteger index){

//Remove tag

[weakView removeTagAtIndex:index];

};

view;

});

[self.view addSubview:self.tagView];

[self.tagView mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(weakSelf.view).with.offset(10);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.top.equalTo(tagText.mas_bottom).with.offset(10);

}];

//label标识语

UILabel *label = [[UILabel alloc]init];

label.font = [UIFont systemFontOfSize:13];

label.textColor = [UIColor redColor];

label.text = @”PS:成员和视频越多得社团越容易被发现!”;

[self.view addSubview:label];

[label mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(weakSelf.view).with.offset(10);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.top.equalTo(self.tagView.mas_bottom).with.offset(20);

}];

UIButton *commitBtn = [[UIButton alloc]init];

[commitBtn setCornerRadius:5];

[commitBtn setBorderWidth:1 color:DBTextThemeColor];

[commitBtn setTitleColor:DBTextThemeColor forState:UIControlStateNormal];

commitBtn.titleLabel.font = [UIFont systemFontOfSize:15];

[commitBtn setTitle:@”确认发布” forState:UIControlStateNormal];

[commitBtn addTarget:self action:@selector(commitButton) forControlEvents:UIControlEventTouchDown];

[self.view addSubview:commitBtn];

[commitBtn mas_makeConstraints:^(MASConstraintMaker *make) {

make.height.mas_equalTo(@30);

make.left.equalTo(weakSelf.view).with.offset(10);

make.right.equalTo(weakSelf.view).with.offset(-10);

make.top.equalTo(label.mas_bottom).with.offset(50);

}];

}