Masonry 控件详解

时间:2024-03-27 11:03:38

1.   Masonry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

2.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;

3.常见约束的各种类型

1.尺寸:width、height、size

2.边界:left、leading、right、trailing、top、bottom

3.中心点:center、centerX、centerY

4.边界:edges

5.偏移量:offset、insets、sizeOffset、centerOffset

6.priority()约束优先级(0~1000),multipler乘因数,
dividedBy除因数

4.Masonry约束易忽略的技术点

使用Masonry不需要设置控件的translatesAutoresizingMaskIntoConstraints属性为NO;

防止block中的循环引用,使用弱引用(这是错误观点),在这里block是局部的引用,block内部引用self不会造成循环引用的

__weak typeof
(self) weakSelf = self;(没必要的写法)

5.Masonry约束控件出现冲突的问题

当约束冲突发生的时候,我们可以设置view的key来定位是哪个view

redView.mas_key =
@"redView";

greenView.mas_key
= @"greenView";

blueView.mas_key =
@"blueView";

若是觉得这样一个个设置比较繁琐,怎么办呢,Masonry则提供了批量设置的宏MASAttachKeys

MASAttachKeys(redView,greenView,blueView);
//一句代码即可全部设置

6. equalTo mas_equalTo的区别

mas_equalTo只是对其参数进行了一个BOX(装箱) 操作,目前支持的类型:数值类型(NSNumber)、 点(CGPoint)、大小(CGSize)、边距(UIEdgeInsets),而equalTo:这个方法不会对参数进行包装。

7.Masonry 布局
    make.top.equalTo(view).with.offset(10);//
距离上10
    make.left.equalTo(view).with.offset(10);//距离左10
    make.bottom.equalTo(view).with.offset(-10);//距离下10
    make.right.equalTo(view).with.offset(-10);//距离右10

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

等高 \等宽

make.height.mas_equalTo(@[redView, blueView]);

make.width.mas_equalTo(@[redView, blueView]);

最大值

make.width.height.lessThanOrEqualTo(@250);

最大放大到整个view
make.width.height.lessThanOrEqualTo(self.view);

最小值make.width.height.greaterThanOrEqualTo(@90);

优先级最低

make.width.height.mas_equalTo(100
* self.scacle).priorityLow();

设置高/宽为3:1,要求是同一个控件的属性比例

make.height.mas_equalTo(bottomInnerView.mas_width).multipliedBy(3);


axisType         轴线方向


fixedSpacing     间隔大小


fixedItemLength  每个控件的固定长度/宽度


leadSpacing      头部间隔


tailSpacing      尾部间隔

//首先添加5个视图

NSMutableArray *array = [NSMutableArray new];

for (int i = 0; i < 5; i ++) {

UIView *view = [UIView new];

view.backgroundColor = [UIColor
greenColor];

[self addSubview:view];

[array addObject:view]; //保存添加的控件

}

水平方向控件间隔固定等间隔

[array
mas_distributeViewsAlongAxis:MASAxisTypeHorizontal withFixedSpacing:15
leadSpacing:10 tailSpacing:10];

[array
makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(50);

make.height.equalTo(70);

}];

水平方向宽度固定等间隔

[array mas_distributeViewsAlongAxis:MASAxisTypeHorizontal
withFixedItemLength:70 leadSpacing:10 tailSpacing:10];

[array
makeConstraints:^(MASConstraintMaker *make) { //数组额你不必须都是view

make.top.equalTo(50);

make.height.equalTo(70);

}];

设置preferredMaxLayoutWidth: 多行label约束的完美解决

[self.label
makeConstraints:^(MASConstraintMaker *make) {

make.left.top.equalTo(10);

make.right.equalTo(-10);

}];

更新约束
mas_updateConstraints

// 告诉self.view约束需要更新

[self.view setNeedsUpdateConstraints];

// 调用此方法告诉self.view检测是否需要更新约束,若需要则更新,下面添加动画效果才起作用

[self.view updateConstraintsIfNeeded];

[UIView animateWithDuration:0.3 animations:^{

[self.view layoutIfNeeded];

}];

- (void)updateViewConstraints {

[self.growingButton mas_updateConstraints:^(MASConstraintMaker *make) {
}];

[super updateViewConstraints];

}