iOS Masonry(约束)的基本使用

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一、简介

Masonry是一个轻量级的布局框架拥有自己的描述语法采用更优雅的链式语法封装自动布局简洁明了并具有高可读性而且同时支持 iOS 和 Max OS X。

Masonry支持的一些属性

//左侧@property (nonatomic, strong, readonly) MASConstraint *left;//上侧@property (nonatomic, strong, readonly) MASConstraint *top;//右侧@property (nonatomic, strong, readonly) MASConstraint *right;//下侧@property (nonatomic, strong, readonly) MASConstraint *bottom;//顶部@property (nonatomic, strong, readonly) MASConstraint *leading;//底部@property (nonatomic, strong, readonly) MASConstraint *trailing;//宽@property (nonatomic, strong, readonly) MASConstraint *width;//高@property (nonatomic, strong, readonly) MASConstraint *height;//横向中点@property (nonatomic, strong, readonly) MASConstraint *centerX;//纵向中点@property (nonatomic, strong, readonly) MASConstraint *centerY;//文本基线@property (nonatomic, strong, readonly) MASConstraint *baseline;

二、基本使用

1、创建一个坐标为(100,100)，宽度100，高度100的view：

    UIView *view = [UIView new];    view.backgroundColor = [UIColor orangeColor];    [self.view addSubview:view];    //在做autoLayout之前 一定要先将view添加到superview上 否则会报错    [view mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(@100);        make.top.equalTo(@100);        make.width.equalTo(@100);        make.height.equalTo(@100);    }];

2、创建一个位于屏幕中央，宽度100，高度100的view：

    UIView *view = [UIView new];    view.backgroundColor = [UIColor orangeColor];    [self.view addSubview:view];    [view mas_makeConstraints:^(MASConstraintMaker *make) {        make.width.equalTo(@100);        make.height.equalTo(@100);        make.center.mas_equalTo(view.center);    }];

3、创建一个与屏幕四边间隔都为10的view：

    UIView *view = [UIView new];    view.backgroundColor = [UIColor orangeColor];    [self.view addSubview:view];    [view mas_makeConstraints:^(MASConstraintMaker *make) {        make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));    }];

三、特别说明

在Masonry中能够添加autolayout约束有三个函数

- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *make))block;- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *make))block;- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;/*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 仅保留最新的约束三种函数善加利用 就可以应对各种情况了*/

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