iOS开发之手动布局子视图

手动布局子视图；
下面先看下效果图，我们今天要实现的效果：

这里我们默认用storyboard启动：
首先我们要在白色的屏幕上面创建一个父视图SuperView（蓝色的背景）,在父视图里面创建四个小视图（橘黄色的背景）
下面看代码，
在SuperView.h文件里面：

#import <UIKit/UIKit.h>

@interface SuperView : UIView{

UIView * _view01;

UIView * _view02;

UIView * _view03;

UIView * _view04;

}

//声明创建视图函数

-(void) createSubViews;

@end

在SuperView.m文件里面：

#import "SuperView.h"

@interface SuperView ()

@end

@implementation SuperView

-(void) createSubViews{

//左上角视图

_view01 = [[UIView alloc] init];

_view01.frame=CGRectMake(0, 0, 40, 40);

//右上角视图

_view02 = [[UIView alloc] init];

_view02.frame=CGRectMake(self.bounds.size.width-40, 0, 40, 40);

//右下角视图

_view03 = [[UIView alloc] init];

_view03.frame=CGRectMake(self.bounds.size.width-40, self.bounds.size.height-40, 40, 40);

//左下角视图

_view04 = [[UIView alloc] init];

_view04.frame=CGRectMake(0, self.bounds.size.height-40, 40, 40);

_view01.backgroundColor=[UIColor orangeColor];

_view02.backgroundColor=[UIColor orangeColor];

_view03.backgroundColor=[UIColor orangeColor];

_view04.backgroundColor=[UIColor orangeColor];

[self addSubview:_view01];

[self addSubview:_view02];

[self addSubview:_view03];

[self addSubview:_view04];

}

//当需要重新布局时调用此函数

//通过此函数重新设定子视图的位置

//手动调整子视图的位置

-(void)layoutSubviews{

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:1];

_view01.frame=CGRectMake(0, 0, 40, 40);

_view02.frame=CGRectMake(self.bounds.size.width-40, 0, 40, 40);

_view03.frame=CGRectMake(self.bounds.size.width-40, self.bounds.size.height-40, 40, 40);

_view04.frame=CGRectMake(0, self.bounds.size.height-40, 40, 40);

[UIView commitAnimations];

}

@end

在ViewController.m文件里面：

#import "ViewController.h"

#import "SuperView.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//创建一个父视图

SuperView * sView = [[SuperView alloc]init];

sView.frame = CGRectMake(20, 20, 180, 280);

//父视图调用函数创建四个小视图

[sView createSubViews];

sView.backgroundColor = [UIColor blueColor];

[self.view addSubview:sView];

UIButton * btn01 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

btn01.frame = CGRectMake(240, 480, 80, 40);

[btn01 setTitle:@"放大" forState:UIControlStateNormal];

[btn01 addTarget:self action:@selector(pressLarge) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn01];

UIButton * btn02 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

btn02.frame = CGRectMake(240, 520, 80, 40);

[btn02 setTitle:@"缩小" forState:UIControlStateNormal];

[btn02 addTarget:self action:@selector(pressSmall) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn02];

sView.tag = 101;

}

//放大父视图

-(void) pressLarge{

SuperView * sView = (SuperView*)[self.view viewWithTag:101];

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:1];

sView.frame=CGRectMake(20, 20, 280, 400);

[UIView commitAnimations];

}

//缩小父视图

-(void) pressSmall{

SuperView * sView = (SuperView*)[self.view viewWithTag:101];

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:1];

sView.frame=CGRectMake(20, 20, 180, 280);

[UIView commitAnimations];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

以上代码书写完毕，就达到了上面视图的效果，希望对大家的学习有所帮助，也希望大家多多支持快网idc。

iOS开发之手动布局子视图

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