Masonry练习详解

 
添加约束的方式：

1.通过使用NSLayoutConstraints添加约束到约束数组中,之前必须设置translatesAutoresizingMaskIntoConstraints = NO,即取消自动布局;
 
2.通过使用MASConstraintMaker在block中添加约束,不需要再设置translatesAutoresizingMaskIntoConstraintst 属性,block内部已经帮助完成;
 
 
约束的关系：

equalTo  <=======>   NSLayoutRelationEqual   等于

lessThanOrEqualTo   <======>  NSLayoutRelationLessThanOrEqual   小于或等于

greaterThanOrEqualTo <=======>  NSLayoutRelationGreaterThanOrEqual  大于或等于

 

MASViewAttribute：视图约束属性

 
 
UIView/NSView
这两个约束完全相同，都是view左边大于等于label的左边位置
make.left.greaterThanOrEqualTo(label）;
make.left.greaterThanOrEqualTo(label.mas_left）;
 
 
NSNumber给约束设置具体的值
<1>//width >= 200 && width <= 400
make.width.greaterThanOrEqualTo(@200);

make.width.lessThanOrEqualTo(@400)
<2>//creates view.left = view.superview.left + 10
make.left.lessThanOrEqualTo(@10)


代替NSNumber，使用原始的数据或者结构体设置约束数据


make.top.mas_equalTo(42);

make.height.mas_equalTo(20);

make.size.mas_equalTo(CGSizeMake(50, 100));

make.edges.mas_equalTo(UIEdgeInsetsMake(10, 0, 10, 0));

make.left.mas_equalTo(view).mas_offset(UIEdgeInsetsMake(10, 0, 10, 0));


 


使用数组NSArray设置约束


make.height.equalTo(@[view1.mas_height, view2.mas_height]);

make.height.equalTo(@[view1, view2]);

make.left.equalTo(@[view1, @100, view3.right]);




 


 


使用优先级设置约束




.priorityHigh <======> UILayoutPriorityDefaultHigh     高优先级


.priorityMedium <========> between high and low        介于高/低之间


.priorityLow <=========> UILayoutPriorityDefaultLow   低优先级






make.left.greaterThanOrEqualTo(label.mas_left).with.priorityLow();

make.top.equalTo(label.mas_top).with.priority(600);




 


使用MASCompositeConstraints添加约束


edges：边缘




// make top, left, bottom, right equal view2

    make.edges.equalTo(view2);

// make top = superview.top + 5, left = superview.left + 10,

// bottom = superview.bottom - 15, right = superview.right - 20

    make.edges.equalTo(superview).insets(UIEdgeInsetsMake(5, 10, 15, 20))




// All edges but the top should equal those of the superview

make.left.right.and.bottom.equalTo(superview);

make.top.equalTo(otherView);


 




size：大小




// make width and height greater than or equal to titleLabel

    make.size.greaterThanOrEqualTo(titleLabel)

// make width = superview.width + 100, height = superview.height - 50

    make.size.equalTo(superview).sizeOffset(CGSizeMake(100, -50))




 


center：中心




// make centerX and centerY = button1

    make.center.equalTo(button1)

// make centerX = superview.centerX - 5, centerY = superview.centerY + 10

    make.center.equalTo(superview).centerOffset(CGPointMake(-5, 10))




 


 


有时候，你需要修改现有的约束，以动画或删除/替换约束。在砌体中有几个不同的方法来更新约束。


1.使用设置References




// in public/private interface

@property (nonatomic, strong) MASConstraint *topConstraint;

...

// when making constraints

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {

    self.topConstraint = make.top.equalTo(superview.mas_top).with.offset(padding.top);

    make.left.equalTo(superview.mas_left).with.offset(padding.left);

}];

...

// then later you can call

[self.topConstraint uninstall];


 


2.更新约束 mas_updateConstraints


- (void)updateConstraints {

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

        make.center.equalTo(self);

        make.width.equalTo(@(self.buttonSize.width)).priorityLow();

        make.height.equalTo(@(self.buttonSize.height)).priorityLow();

        make.width.lessThanOrEqualTo(self);

        make.height.lessThanOrEqualTo(self);

    }];

    //according to apple super should be called at end of method

    [super updateConstraints];

}


 


3.重新设置mas_remakeConstraints


- (void)changeButtonPosition {


    [self.button mas_remakeConstraints:^(MASConstraintMaker *make) {

        make.size.equalTo(self.buttonSize);

        if (topLeft) {

            make.top.and.left.offset(10);

        } else {

            make.bottom.and.right.offset(-10);

        }

    }];

}


具体的实例如下：设置view1举例父视图的四周距离均为50




 方式一：






/**

方式一：使用NSLayoutConstraint实现手动布局

 ----------------------------

 设置UIEdgeInsets

 ----------------------------

 @interface UIView (UIConstraintBasedLayoutInstallingConstraints)

 - (NSArray *)constraints NS_AVAILABLE_IOS(6_0);

 - (void)addConstraint:(NSLayoutConstraint *)constraint NS_AVAILABLE_IOS(6_0);

 - (void)addConstraints:(NSArray *)constraints NS_AVAILABLE_IOS(6_0);

 - (void)removeConstraint:(NSLayoutConstraint *)constraint

 - (void)removeConstraints:(NSArray *)constraints NS_AVAILABLE_IOS(6_0);

*/

-(void)LayoutConstraint

{

    UIView *superView = self.view;

    UIView *view1 = [[UIView alloc]init];

    view1 .translatesAutoresizingMaskIntoConstraints = NO;

    view1.backgroundColor = [UIColor redColor];

    [superView addSubview:view1];

    //设置距离父视图边界距离

    UIEdgeInsets pading = UIEdgeInsetsMake(50, 50, 50, 50);

    //添加给view1约束

    [superView addConstraints:@[

        [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeTop multiplier:1.0 constant:pading.top],

        [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeLeft multiplier:1.0 constant:pading.left],

        [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeBottom multiplier:1.0 constant:-pading.bottom],

        [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeRight multiplier:1.0 constant:-pading.right],

    ]];

}






 方式二：






/**

方法二：使用block  @implementation MAS_VIEW (MASAdditions)

----------------------------

 设置offset偏移 或者 边缘edges

----------------------------

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

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

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

*/

-(void)LayoutForMASConstraintMaker

{

    UIView *superView = self.view;

    UIView *view1 = [[UIView alloc]init];

    view1.backgroundColor = [UIColor redColor];

    [superView addSubview:view1];

    //设置距离父视图边界距离

    UIEdgeInsets pading = UIEdgeInsetsMake(50, 50, 50, 50);

    //添加给view1约束

    [view1 mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.equalTo(superView.mas_top).with.offset(pading.top);

        make.left.equalTo(superView.mas_left).with.offset(pading.left);

        make.bottom.equalTo(superView.mas_bottom).with.offset(-pading.bottom);

        make.right.equalTo(superView.mas_right).with.offset(-pading.right);

        //设置代码可以更简单（效果与上面的是一样的）

        //make.edges.equalTo(superView).with.insets(pading);

    }];

}






 方式三：






/**

方式三：使用block  @implementation MAS_VIEW (MASAdditions)

 ----------------------------

 设置margin距离

 ----------------------------

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

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

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

*/

-(void)LayoutForMASConstraintMakerWithMargin

{

    UIView *superView = self.view;

    UIView *view1 = [[UIView alloc]init];

    view1.backgroundColor = [UIColor redColor];

    [superView addSubview:view1];

    //添加给view1约束

    [view1 mas_makeConstraints:^(MASConstraintMaker *make) {

        make.topMargin.equalTo(superView.mas_top).with.offset(50);

        make.leftMargin.equalTo(superView.mas_left).with.offset(50);

        make.bottomMargin.equalTo(superView.mas_bottom).with.offset(-50);

        make.rightMargin.equalTo(superView.mas_right).with.offset(-50);

    }];

}






 方式四：






/**

 方式四：使用block  @implementation MAS_VIEW (MASAdditions)

 ----------------------------

 设置center和size

 ----------------------------

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

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

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

 */

-(void)LayoutForMASConstraintMakerWithCenterWidthHeight

{

    UIView *superView = self.view;

    UIView *view1 = [[UIView alloc]init];

    view1.backgroundColor = [UIColor redColor];

    [superView addSubview:view1];

    //添加给view1约束

    [view1 mas_makeConstraints:^(MASConstraintMaker *make) {

        make.centerX.equalTo(superView);

        make.centerY.equalTo(superView);

        make.size.equalTo(superView).sizeOffset(CGSizeMake(-100,-100));

    }];

}






 演示结果：


  


 


 


 


 


 


 


 


 
												


																

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