iOS-布局-Masonry

一.说明：demo中的举例视图介绍
UIView *_blackView; 作为父视图
UIView *_redView; 与父视图内边距为10
UIView *_orangeView1; 父视图的内左视图
UIView *_orangeView2; 父视图的内右视图

二.先上演示截图
1黑色父视图



2.在黑色父视图上添加距父视图内边距为10的红色视图



3.在黑色父视图上添加两个橘黄色视图



4.在黑色父视图上添加三个等边距的视图



5.在黑色视图上添加滑动视图
(1)滑动视图的头视图



(2)滑动视图的尾部视图



三.解惑
1.关键词
make 需要添加约束的对象
and 无具体意义的语句连贯词
with 无具体意义的语句连贯词
offset 边距
equalTo 相对于，等同于

multipliedBy    倍数

举例：make.width.equalTo(self.view.mas_width).multipliedBy(0.5);//设置宽度为self.view的一半，multipliedBy是倍数的意思，也就是，使宽度等于self.view宽度的0.5倍

2.make的属性

// 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;

3.分类

分类	含义	举例
size	尺寸，包含(wdith,height)	make.size.mas_equalTo(CGSizeMake(300, 300));
edges	边距，包含(top,left,right,bottom)	make.edges.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10)); 可以写成 make.top.equalTo(_blackView).with.offset(10); make.left.equalTo(_blackView).with.offset(10); make.bottom.equalTo(_blackView).with.offset(-10); make.right.equalTo(_blackView).with.offset(-10); 或者 make.top.left.bottom.and.right.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
center	中心，包含(centerX,centerY)	make.center.equalTo(self.view);

4.对比





其中leading与left trailing与right 在正常情况下是等价的 但是当一些布局是从右至左时(比如阿拉伯文?没有类似的经验) 则会对调 换句话说就是基本可以不理不用 用left和right就好了。

以上说明了上下左右等属性的对应替代属性。

四.三个添加约束的方法

//设置约束
- (NSArray *)mas_makeConstraints:(void(^)(MASConstraintMaker *))block;

//如果之前已经有约束,则更新新的约束,如果没有约束,则添加约束
- (NSArray *)mas_updateConstraints:(void(^)(MASConstraintMaker *))block;

//将之前的约束全部删除,添加新的约束
- (NSArray *)mas_remakeConstraints:(void(^)(MASConstraintMaker *make))block;

五.添加控件
(
1.需要把控件先添加到父视图上，否则会报错。
2.不需要 _blackView.translatesAutoresizingMaskIntoConstraints = NO;已经封装进去了
3.只需要设置一些与控件frame无关的就可以了
)
_blackView = [UIView new];
_blackView.backgroundColor = [UIColor blackColor];
// 在做autoLayout 之前 一定要先将view添加到superView上， 否则会报错
[self.view addSubview:_blackView];

六.给控件添加约束
效果：控件的bounds(0,0,300,300).控件的中心在self.view的中心上。两个约束确定了控件的位置。
//mas_makeConstrains就是Masonry的autoLayout添加函数 将所需的约束添加到block中就行了
[_blackView mas_makeConstraints:^(MASConstraintMaker *make) {
//居中
make.center.equalTo(self.view);
//将size设置成(300,300);
make.size.mas_equalTo(CGSizeMake(300, 300));
}];

七.代码

#import "ViewController.h"

#import "Masonry.h"

@interface ViewController ()

{
UIView *_blackView;
UIView *_redView;
UIView *_orangeView1;
UIView *_orangeView2;
UIScrollView *_scrolView;

}

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

[self addBlackView];

//[self addRedView];

//[self addTwoOrangeColorView];

//[self addMoreView];

[self addScrolView];

}

#pragma mark 添加黑色视图

- (void)addBlackView

{
_blackView = [UIView new];
_blackView.backgroundColor = [UIColor blackColor];

// 在做autoLayout 之前 一定要先将view添加到superView上， 否则会报错
[self.view addSubview:_blackView];

//mas_makeConstrains就是Masonry的autoLayout添加函数 将所需的约束添加到block中就行了
[_blackView mas_makeConstraints:^(MASConstraintMaker *make) {

//居中
make.center.equalTo(self.view);

//将size设置成(300,300);
make.size.mas_equalTo(CGSizeMake(300, 300));
}];

}

#pragma mark 添加红色视图

- (void)addRedView

{
_redView = [UIView new];
_redView.backgroundColor = [UIColor redColor];
[self.view addSubview:_redView];

[_redView mas_makeConstraints:^(MASConstraintMaker *make) {

//这三种方式等价

//方式一：
make.edges.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));

//方式二：

// make.top.equalTo(_blackView).with.offset(10);

// make.left.equalTo(_blackView).with.offset(10);

// make.bottom.equalTo(_blackView).with.offset(-10);

// make.right.equalTo(_blackView).with.offset(-10);

//方式三：

// make.top.left.bottom.and.right.equalTo(_blackView).with.insets(UIEdgeInsetsMake(10, 10, 10, 10));
}];

}

#pragma mark 添加俩橘色视图

- (void)addTwoOrangeColorView

{
//定义边距为10
int padding1 = 10;

_orangeView1 = [UIView new];
_orangeView1.backgroundColor = [UIColor orangeColor];
[self.view addSubview:_orangeView1];

_orangeView2 = [UIView new];
_orangeView2.backgroundColor = [UIColor orangeColor];
[self.view addSubview:_orangeView2];

[_orangeView1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(_blackView.mas_centerY);
make.left.equalTo(_blackView.mas_left).with.offset(padding1);
make.right.equalTo(_orangeView2.mas_left).with.offset(-padding1);
make.height.mas_equalTo(@150);
make.width.equalTo(_orangeView2);
}];

[_orangeView2 mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.mas_equalTo(_blackView.mas_centerY);
make.left.equalTo(_orangeView1.mas_right).with.offset(padding1);
make.right.equalTo(_blackView.mas_right).with.offset(-padding1);
make.height.mas_equalTo(@150);
make.width.equalTo(_orangeView1);
}];

}

#pragma mark 添加多个等间距的视图

- (void)addMoreView

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

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

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

int padding = 10;

[view1 mas_makeConstraints:^(MASConstraintMaker *make) {
//设置竖直方向约束
// 设置view1的Y中心点
make.centerY.mas_equalTo(_blackView);
// 设置高度
make.height.mas_equalTo(@150);

//设置水平方向约束
// 设置左侧距离父视图10
make.left.equalTo(_blackView).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);
// 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(_blackView);
make.height.mas_equalTo(view1);
make.width.equalTo(@[view1, view3]);
}];

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

}

#pragma mark 添加滑动视图

- (void)addScrolView

{
_scrolView = [UIScrollView new];
_scrolView.backgroundColor = [UIColor whiteColor];
[_blackView addSubview:_scrolView];
[_scrolView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(_blackView).with.insets(UIEdgeInsetsMake(5, 5, 5, 5));
}];

UIView * container = [UIView new];
[_scrolView addSubview:container];
[container mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(_scrolView);
make.width.equalTo(_scrolView);
}];

int count = 10;
UIView * lastView = nil;
for (int i = 0; i <= count; i ++)
{
UIView * subView = [UIView new];
[container addSubview:subView];
subView.backgroundColor = [UIColor colorWithHue:(arc4random() % 156 / 256.0) saturation:(arc4random() % 128 / 256.0) brightness:(arc4random() % 128 / 256.0) alpha:1];
[subView mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.and.right.equalTo(container);
make.height.equalTo(@(20*i));

if (lastView) {
make.top.mas_equalTo(lastView.mas_bottom);
}
else
{
make.top.mas_equalTo(container.mas_top);
}
}];
lastView = subView;
}
[container mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(lastView.mas_bottom);
}];

}

- (void)viewDidAppear:(BOOL)animated

{
[super viewDidAppear:animated];

NSLog(@"_blackView.frame: %@",NSStringFromCGRect(_blackView.frame));

NSLog(@"_blackView1.frame: %@",NSStringFromCGRect(_blackView.frame));

NSLog(@"_orangeView1.frame: %@",NSStringFromCGRect(_orangeView1.frame));

NSLog(@"_orangeView2.frame: %@",NSStringFromCGRect(_orangeView2.frame));

NSLog(@"_scrolView.frame: %@",NSStringFromCGRect(_scrolView.frame));

}
@end