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是一个用代码写iOS或OS界面的库，可以代替Auto layout。Masonry的github地址：https://github.com/SnapKit/Masonry
以下将从三个方面介绍 如下：
- Masonry配置 - Masonry使用 - Masonry实例
1 Masonry配置
- 推荐使用pods方式引入类库，pod 'Masonry'，若不知道pod如何使用，可参考文章： 提高ios开发效率的工具
然后 - 引入头文件 #import "Masonry.h"即可。
Masonry使用讲解
mas_makeConstraints 是给view添加约束，约束有几种，分别是边距，宽，高，左上右下距离，基准线。添加过约束后可以有修正，修正有offset（位移）修正和multipliedBy（倍率）修正。
语法一般是 make.equalTo or make.greaterThanOrEqualTo or make.lessThanOrEqualTo + 倍数和位移修正。
注意点1： 使用 mas_makeConstraints方法的元素必须事先添加到父元素的中，例如[self.view addSubview:view];
注意点2： mas_equalTo 和 equalTo 区别：mas_equalTo 比equalTo多了类型转换操作，一般来说，大多数时候两个方法都是通用的，但是对于数值元素使用mas_equalTo。对于对象或是多个属性的处理，使用equalTo。特别是多个属性时，必须使用equalTo,例如 make.left.and.right.equalTo(self.view);
注意点3: 注意到方法with和and,这连个方法其实没有做任何操作，方法只是返回对象本身,这个方法的左右完全是为了方法写的时候的可读性 。make.left.and.right.equalTo(self.view);和make.left.right.equalTo(self.view);是完全一样的，但是明显的加了and方法的语句可读性 更好点。
Masonry初级使用例子
// exp1: 中心点与self.view相同，宽度为100*400 300*200
-(void)exp1{
UIView *view = [UIView new];
[view setBackgroundColor:[UIColor redColor]];
[self.view addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.center.equalTo(self.view);
make.size.mas_equalTo(CGSizeMake(100,400));
}];
UIView *view1=[UIView new];
[view1 setBackgroundColor:[UIColor blackColor]];
[self.view addSubview:view1];
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.center.equalTo(self.view);
make.size.mas_equalTo(CGSizeMake(300, 200));
}];
}
//exp2: 上下左右边距都为10
-(void)exp2{
UIView *view = [UIView new];
[view setBackgroundColor:[UIColor redColor]];
[self.view addSubview:view];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.view).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
// make.top.equalTo(self.view).with.offset(10);
// make.left.equalTo(self.view).with.offset(10);
// make.bottom.equalTo(self.view).with.offset(-10);
// make.right.equalTo(self.view).with.offset(-10);
}];
}
//exp3 让两个高度为150的view垂直居中且等宽且等间隔排列 间隔为10
-(void)exp3{
UIView *view1 = [UIView new];
[view1 setBackgroundColor:[UIColor blueColor]];
[self.view addSubview:view1];
UIView *view2 = [UIView new];
[view2 setBackgroundColor:[UIColor redColor]];
[self.view addSubview:view2];
[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(self.view.mas_centerY);
make.height.mas_equalTo(150);
make.width.mas_equalTo(view2.mas_width);
make.left.mas_equalTo(self.view.mas_left).with.offset(10);
make.right.mas_equalTo(view2.mas_left).offset(-10);
}];
[view2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(self.view.mas_centerY);
make.height.mas_equalTo(150);
make.width.mas_equalTo(view1.mas_width);
make.left.mas_equalTo(view1.mas_right).with.offset(10);
make.right.equalTo(self.view.mas_right).offset(-10);
}];
}
Masonry高级使用例子1
iOS计算器使用Masorny布局：
//高级布局练习 ios自带计算器布局
-(void)exp4{
//申明区域，displayView是显示区域，keyboardView是键盘区域
UIView *displayView = [UIView new];
[displayView setBackgroundColor:[UIColor blackColor]];
[self.view addSubview:displayView];
UIView *keyboardView = [UIView new];
[self.view addSubview:keyboardView];
//先按1：3分割 displView（显示结果区域）和 keyboardView（键盘区域）
[displayView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.view.mas_top);
make.left.and.right.equalTo(self.view);
make.height.equalTo(keyboardView).multipliedBy(0.3f);
}];
[keyboardView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(displayView.mas_bottom);
make.bottom.equalTo(self.view.mas_bottom);
make.left.and.right.equalTo(self.view);
}];
//设置显示位置的数字为0
UILabel *displayNum = [[UILabel alloc]init];
[displayView addSubview:displayNum];
displayNum.text = @"0";
displayNum.font = [UIFont fontWithName:@"HeiTi SC" size:70];
displayNum.textColor = [UIColor whiteColor];
displayNum.textAlignment = NSTextAlignmentRight;
[displayNum mas_makeConstraints:^(MASConstraintMaker *make) {
// make.left.and.right.equalTo(displayView).with.offset(-10);
// make.right.equalTo(displayView).with.offset(-10);
make.right.equalTo(self.view).offset(-10);
make.bottom.equalTo(displayView).with.offset(-10);
}];
//定义键盘键名称，？号代表合并的单元格
NSArray *keys = @[@"AC",@"+/-",@"%",@"÷"
,@"7",@"8",@"9",@"x"
,@"4",@"5",@"6",@"-"
,@"1",@"2",@"3",@"+"
,@"0",@"?",@".",@"="];
int indexOfKeys = 0;
for (NSString *key in keys){
//循环所有键
indexOfKeys++;
int rowNum = indexOfKeys %4 ==0? indexOfKeys/4:indexOfKeys/4 +1;
int colNum = indexOfKeys %4 ==0? 4 :indexOfKeys %4;
NSLog(@"index is:%d and row:%d,col:%d",indexOfKeys,rowNum,colNum);
//键样式
UIButton *keyView = [UIButton buttonWithType:UIButtonTypeCustom];
[keyboardView addSubview:keyView];
[keyView setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[keyView setTitle:key forState:UIControlStateNormal];
[keyView.layer setBorderWidth:1];
[keyView.layer setBorderColor:[[UIColor blackColor]CGColor]];
[keyView.titleLabel setFont:[UIFont fontWithName:@"Arial-BoldItalicMT" size:30]];
//键约束
[keyView mas_makeConstraints:^(MASConstraintMaker *make) {
//处理 0 合并单元格
if([key isEqualToString:@"0"] || [key isEqualToString:@"?"] ){
if([key isEqualToString:@"0"]){
[keyView mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
make.width.equalTo(keyboardView.mas_width).multipliedBy(.5);
make.left.equalTo(keyboardView.mas_left);
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.9f);
}];
}if([key isEqualToString:@"?"]){
[keyView removeFromSuperview];
}
}
//正常的单元格
else{
make.width.equalTo(keyboardView.mas_width).with.multipliedBy(.25f);
make.height.equalTo(keyboardView.mas_height).with.multipliedBy(.2f);
//按照行和列添加约束，这里添加行约束
switch (rowNum) {
case 1:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.1f);
keyView.backgroundColor = [UIColor colorWithRed:205 green:205 blue:205 alpha:1];
}
break;
case 2:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.3f);
}
break;
case 3:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.5f);
}
break;
case 4:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.7f);
}
break;
case 5:
{
make.baseline.equalTo(keyboardView.mas_baseline).with.multipliedBy(.9f);
}
break;
default:
break;
}
//按照行和列添加约束，这里添加列约束
switch (colNum) {
case 1:
{
make.left.equalTo(keyboardView.mas_left);
}
break;
case 2:
{
make.right.equalTo(keyboardView.mas_centerX);
}
break;
case 3:
{
make.left.equalTo(keyboardView.mas_centerX);
}
break;
case 4:
{
make.right.equalTo(keyboardView.mas_right);
[keyView setBackgroundColor:[UIColor colorWithRed:243 green:127 blue:38 alpha:1]];
}
break;
default:
break;
}
}
}];
}
}
本例子使用的baseline去控制高度位置，这似乎不是太准，如果想要精准控制高度位置，可以使用一行一行添加的方法，每次当前行的top去equelTo上一行的bottom。 给个提示：
for（遍历所有行)
for（遍历所以列）
//当前行约束根据上一行去设置