IOS不用AutoLayout也能实现自己主动布局的类(3)----MyRelativeLayout横空出世

-(void)loadView
{
    
    MyRelativeLayout *rl = [MyRelativeLayout new];
    rl.padding = UIEdgeInsetsMake(10, 10, 10, 10);
    rl.backgroundColor = [UIColor grayColor];
    self.view = rl;
    
    UILabel *lb1 = [UILabel new];
    [rl addSubview:lb1];
    lb1.text = @"你好";
    [lb1 sizeToFit];
    lb1.backgroundColor = [UIColor blueColor];
   
    
    lb1.leftPos.equalTo(rl.leftPos); //和父视图左边一致
    lb1.topPos.equalTo(rl.topPos).offset(10); //和父视图顶部一致并偏移10
    lb1.widthDime.equalTo(@60); //固定宽度
    
    UILabel *lb2 = [UILabel new];
    [rl addSubview:lb2];
    lb2.text = @"我好 hello";
    lb2.backgroundColor = [UIColor redColor];
    
    lb2.leftPos.equalTo(lb1.rightPos);
    lb2.topPos.equalTo(lb1.bottomPos);
    lb2.widthDime.equalTo(lb1.widthDime).add(30); //宽度是lb1的宽度加30
    lb2.heightDime.equalTo(lb1.heightDime).multiply(2).add(-10); //高度是lb1高度的2倍再-10
    
    UILabel *lb3 = [UILabel new];
    lb3.text = @"中间";
    lb3.backgroundColor = [UIColor greenColor];
    [rl addSubview:lb3];
    
    lb3.centerXPos.equalTo(rl.centerXPos);
    lb3.centerYPos.equalTo(rl.centerYPos);
    lb3.widthDime.equalTo(rl.widthDime).multiply(0.2);
    lb3.heightDime.equalTo(rl.heightDime).multiply(0.1);
    
    UILabel *lb4 = [UILabel new];
    lb4.text = @"他好";
    [lb4 sizeToFit];
    lb4.backgroundColor = [UIColor orangeColor];
    [rl addSubview:lb4];
    
    //宽度和高度由左右决定
    lb4.leftPos.equalTo(rl.leftPos);
    lb4.rightPos.equalTo(rl.rightPos);
    lb4.topPos.equalTo(@100);
   
}

第三排的子视图按0.2 0.3 0.5的比例来平分父视图，代码例如以下：

-(void)loadView
{
    MyRelativeLayout *rl = [MyRelativeLayout new];
    rl.padding = UIEdgeInsetsMake(0, 0, 0, 10);
    rl.backgroundColor = [UIColor grayColor];
    self.view = rl;
    
    /**水平平分3个子视图**/
    UIView *v1 = [UIView new];
    v1.backgroundColor = [UIColor redColor];
    v1.heightDime.equalTo(@40);
    [rl addSubview:v1];
    
    UIView *v2 = [UIView new];
    v2.backgroundColor = [UIColor redColor];
    v2.heightDime.equalTo(@40);
    [rl addSubview:v2];

    UIView *v3 = [UIView new];
    v3.backgroundColor = [UIColor redColor];
    v3.heightDime.equalTo(@40);
    [rl addSubview:v3];

    //v1,v2,v3平分父视图的宽度。在平分前减去了30用作间距
    v1.widthDime.equalTo(@[v2.widthDime.add(-10), v3.widthDime.add(-10)]).add(-10);
    v1.leftPos.offset(10);
    v2.leftPos.equalTo(v1.rightPos).offset(10);
    v3.leftPos.equalTo(v2.rightPos).offset(10);
    

    /**某个视图固定其它平分**/
    UIView *v4 = [UIView new];
    v4.backgroundColor = [UIColor greenColor];
    v4.topPos.equalTo(v1.bottomPos).offset(80);
    v4.heightDime.equalTo(@40);
    v4.widthDime.equalTo(@260); //第一个视图宽度固定
    [rl addSubview:v4];
    
    UIView *v5 = [UIView new];
    v5.backgroundColor = [UIColor greenColor];
    v5.topPos.equalTo(v4.topPos);
    v5.heightDime.equalTo(@40);
    [rl addSubview:v5];
    
    UIView *v6 = [UIView new];
    v6.backgroundColor = [UIColor greenColor];
    v6.topPos.equalTo(v4.topPos);
    v6.heightDime.equalTo(@40);
    [rl addSubview:v6];
    
    //v1,v2,v3平分父视图的宽度。在平分前减去了30用作间距
    v5.widthDime.equalTo(@[v4.widthDime.add(-10), v6.widthDime.add(-10)]).add(-10);
    v4.leftPos.offset(10);
    v5.leftPos.equalTo(v4.rightPos).offset(10);
    v6.leftPos.equalTo(v5.rightPos).offset(10);
    
 
    
    /**子视图按比例平分**/
    UIView *v7 = [UIView new];
    v7.backgroundColor = [UIColor blueColor];
    v7.topPos.equalTo(v4.bottomPos).offset(80);
    v7.heightDime.equalTo(@40);
    [rl addSubview:v7];
    
    UIView *v8 = [UIView new];
    v8.backgroundColor = [UIColor blueColor];
    v8.topPos.equalTo(v7.topPos);
    v8.heightDime.equalTo(@40);
    [rl addSubview:v8];
    
    UIView *v9 = [UIView new];
    v9.backgroundColor = [UIColor blueColor];
    v9.topPos.equalTo(v7.topPos);
    v9.heightDime.equalTo(@40);
    [rl addSubview:v9];
    
    v7.widthDime.equalTo(@[v8.widthDime.multiply(0.3).add(-10),v9.widthDime.multiply(0.5).add(-10)]).multiply(0.2).add(-10);
    v7.leftPos.offset(10);
    v8.leftPos.equalTo(v7.rightPos).offset(10);
    v9.leftPos.equalTo(v8.rightPos).offset(10);
    
    //请分别设置每一个视图.hidden = YES 而且设置布局的@property(nonatomic, assign) BOOL flexOtherViewWidthWhenSubviewHidden为YES和NO的效果

}

//均分宽度时当有隐藏子视图，是否參与宽度计算,这个属性仅仅有在參与均分视图的子视图隐藏时才有效,默认是NO

@property(nonatomic,assign)BOOL flexOtherViewWidthWhenSubviewHidden;

//均分高度时当有隐藏子视图，是否參与高度计算,这个属性仅仅有在參与均分视图的子视图隐藏时才有效。默认是NO

@property(nonatomic,assign)BOOL flexOtherViewHeightWhenSubviewHidden;

这时候我们就不须要手动的指定布局视图的高度和宽度，而是由布局视图里面的子视图来决定布局的尺寸，在android系统中我们能够设置wrapContent来设置布局视图的尺寸。

相同我们在布局中也分别提供了两个属性：

@property(nonatomic,assign)BOOL wrapContentWidth;

@property(nonatomic,assign)BOOL wrapContentHeight;

而对于相对布局来说两者默认都设置为NO。

-(void)loadView
{
    [super loadView];
    
    MyRelativeLayout *rl = [[MyRelativeLayout alloc] initWithFrame:CGRectMake(10, 10, 0, 0)];
    rl.padding = UIEdgeInsetsMake(10, 10, 10, 10);
    [self.view addSubview:rl];
    rl.wrapContentWidth = YES;
    rl.wrapContentHeight = YES; //设置宽度和高度由全部子视图包裹
    rl.backgroundColor = [UIColor grayColor];
    
    UILabel *lb1 = [UILabel new];
    lb1.leftPos.equalTo(rl.leftPos).offset(20);
    lb1.text = @"aaaa";
    lb1.backgroundColor = [UIColor redColor];
    [lb1 sizeToFit];
    lb1.rightPos.offset(20);
    
    [rl addSubview:lb1];
    
    
    UILabel *lb3 = [UILabel new];
    lb3.rightPos.equalTo(rl.rightPos).offset(5); //尽管这时候父视图的宽度为0,但还是能够设置离父视图的距离
    lb3.topPos.equalTo(rl.topPos).offset(30);
    lb3.bottomPos.offset(10);
    lb3.text = @"ccc";
    lb3.backgroundColor = [UIColor redColor];
    [lb3 sizeToFit];
    
    [rl addSubview:lb3];
    
    
    UILabel *lb2 = [UILabel new];
    lb2.text = @"bbbb";
    lb2.backgroundColor = [UIColor blueColor];
    
    lb2.leftPos.equalTo(lb1.centerXPos);
    lb2.topPos.equalTo(lb1.bottomPos).offset(40);
    lb2.widthDime.equalTo(@50);
    lb2.heightDime.equalTo(@50);
    lb2.bottomPos.offset(40);

   
    [rl addSubview:lb2];
    
    
    
}