Masonry简单使用

Masonry源码

如果使用过iOS中系统的

NSLayoutConstraints

已经知道非常麻烦

如下代码就是系统的约束

UIView *superview = self;

UIView *view1 = [[UIView alloc] init];
view1.translatesAutoresizingMaskIntoConstraints = NO;
view1.backgroundColor = [UIColor greenColor];
[superview addSubview:view1];

UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);

[superview addConstraints:@[

//view1 constraints
[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeTop
multiplier:1.0
constant:padding.top],

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

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

[NSLayoutConstraint constraintWithItem:view1
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:superview
attribute:NSLayoutAttributeRight
multiplier:1
constant:-padding.right],

]];

[/code]
 

安装

直接进入github进行源码下载
使用CocoaPod进行下载
 

使用

在上面介绍的时候我们看到系统要创建一个试图,距离上下左右都是10的这样一个约束需要写上很多代码,然而现在是使用Masonry的效果

UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(superview.mas_top).with.offset(padding.top); //with is an optional semantic filler
make.left.equalTo(superview.mas_left).with.offset(padding.left);
make.bottom.equalTo(superview.mas_bottom).with.offset(-padding.bottom);
make.right.equalTo(superview.mas_right).with.offset(-padding.right);
}];

[/code]
甚至我们这样写得更加简洁

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(superview).with.insets(padding);
}];

[/code]
接下来我们来观看下Masonry中的一些常用属性

// 左侧
@property (nonatomic, strong, readonly) MASConstraint *left;
// 顶部
@property (nonatomic, strong, readonly) MASConstraint *top;
// 右侧
@property (nonatomic, strong, readonly) MASConstraint *right;
// 底部
@property (nonatomic, strong, readonly) MASConstraint *bottom;
// 首部
@property (nonatomic, strong, readonly) MASConstraint *leading;
// 尾部
@property (nonatomic, strong, readonly) MASConstraint *trailing;
// 宽
@property (nonatomic, strong, readonly) MASConstraint *width;
// 高
@property (nonatomic, strong, readonly) MASConstraint *height;
// 中心点x
@property (nonatomic, strong, readonly) MASConstraint *centerX;
// 中心点y
@property (nonatomic, strong, readonly) MASConstraint *centerY;
// 文本基线
@property (nonatomic, strong, readonly) MASConstraint *baseline;

[/code]
 

居中显示视图

UIView *myView = [[UIView alloc] init];
myView.backgroundColor = [UIColor blueColor];
[self.view addSubview:myView];

[myView mas_makeConstraints:^(MASConstraintMaker *make) {
// 设置当前center和父视图的center一样
make.center.mas_equalTo(self.view);
// 设置当前视图的大小
make.size.mas_equalTo(CGSizeMake(300, 300));
}];

[/code]
效果图

可以看到我们已经创建出一个位置居中,并且视图大小为300×300

 

设置视图并排

UIView *view1 = [[UIView alloc] init];
view1.backgroundColor = [UIColor redColor];
[myView addSubview:view1];

UIView *view2 = [[UIView alloc] init];
view2.backgroundColor = [UIColor yellowColor];
[myView addSubview:view2];

int padding = 10;

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
// 设置其位于父视图的Y的中心位置
make.centerY.mas_equalTo(myView.mas_centerY);
// 设置其左侧和父视图偏移10个像素
make.left.equalTo(myView).with.offset(padding);
// 设置其右侧和view2偏移10个像素
make.right.equalTo(view2.mas_left).with.offset(-padding);
// 设置高度
make.height.mas_equalTo(@120);
// 设置其宽度
make.width.equalTo(view2);
}];

[view2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(myView.mas_centerY);
make.left.equalTo(view1.mas_right).with.offset(padding);
make.right.equalTo(myView).with.offset(-padding);
make.height.mas_equalTo(view1);
make.width.equalTo(view1);
}];

[/code]
效果图:

提醒一下,以下代码等价

make.left.equalTo(myView).with.offset(padding);
// 等价于
make.left.equalTo(myView.mas_left).with.offset(padding);

[/code]
也就是说默认情况下括号里面只写了视图的时候,其自动帮你添加当前masxxx(代表前面你需要设置的约束的位置).比如上面两行代码设置的make.left,当括号里面只写了myView的时候,会自动追加为myView.mas_left。

 

多个视图间隔相同

注意下面设置宽度的时候是传递的数组,这样才能让多个视图进行等距离显示

UIView *view1 = [[UIView alloc] init];
view1.backgroundColor = [UIColor redColor];
[myView addSubview:view1];

UIView *view2 = [[UIView alloc] init];
view2.backgroundColor = [UIColor yellowColor];
[myView addSubview:view2];

UIView *view3 = [[UIView alloc] init];
view3.backgroundColor = [UIColor greenColor];
[self.view addSubview:view3];

int padding = 10;

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
// 设置中心点
make.centerY.mas_equalTo(myView);
// 设置左侧距离父视图10
make.left.equalTo(myView).with.offset(padding);
// 设置右侧距离和view2的左侧相隔10
make.right.equalTo(view2.mas_left).with.offset(-padding);
// 设置高度
make.height.mas_equalTo(@150);
// 宽度设置和view2以及view3相同
make.width.equalTo(@[view2, view3]);
}];

[view2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(myView);
make.height.mas_equalTo(view1);
make.width.equalTo(@[view1, view3]);
}];

[view3 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(myView);
make.left.equalTo(view2.mas_right).with.offset(padding);
make.right.equalTo(myView).with.offset(-padding);
make.height.mas_equalTo(view1);
make.width.equalTo(@[view2, view1]);
}];

[/code]
效果图:

Posted in iOS

Post navigation

One thought on “Masonry简单使用”

一名来自xxx公司的iOS开发者说道：

博主，给你合并下多个视图相隔相同的方法：

__weak typeof(self) weakSelf = self;

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

NSInteger count = 10;//设置一排view的个数

NSInteger margin = 10;//设置相隔距离

NSInteger height = 50;//设置view的高度

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

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

view.backgroundColor = [UIColor brownColor];

[self.view addSubview:view];

if (i == 0) {

[view mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(weakSelf.view).offset(margin);

make.centerY.equalTo(weakSelf.view);

make.height.mas_equalTo(height);

}];

}

else if (i == count – 1){

[view mas_makeConstraints:^(MASConstraintMaker *make) {

make.right.equalTo(weakSelf.view).offset(-margin);

make.left.equalTo(tempView.mas_right).offset(margin);

make.centerY.equalTo(tempView);

make.height.equalTo(tempView);

make.width.equalTo(tempView);

}];

}

else{

[view mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.equalTo(tempView.mas_right).offset(margin);

make.centerY.equalTo(tempView);

make.height.equalTo(tempView);

make.width.equalTo(tempView);

}];

}

tempView = view;

[view layoutIfNeeded];

}