手動布局子視圖；
下面先看下效果圖，我們今天要實現的效果：
這里我們默認用storyboard啟動：
首先我們要在白色的屏幕上面創建一個父視圖SuperView（藍色的背景）,在父視圖里面創建四個小視圖（橘黃色的背景）
下面看代碼，
在SuperView.h文件里面：
#import <UIKit/UIKit.h>@interface SuperView : UIView{ UIView * _view01; UIView * _view02; UIView * _view03; UIView * _view04;}//聲明創建視圖函數-(void) createSubViews;@end在SuperView.m文件里面：#import "SuperView.h"@interface SuperView ()@end@implementation SuperView-(void) createSubViews{ //左上角視圖 _view01 = [[UIView alloc] init]; _view01.frame=CGRectMake(0, 0, 40, 40); //右上角視圖 _view02 = [[UIView alloc] init]; _view02.frame=CGRectMake(self.bounds.size.width-40, 0, 40, 40); //右下角視圖 _view03 = [[UIView alloc] init]; _view03.frame=CGRectMake(self.bounds.size.width-40, self.bounds.size.height-40, 40, 40); //左下角視圖 _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];}//當需要重新布局時調用此函數//通過此函數重新設定子視圖的位置//手動調整子視圖的位置-(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. //創建一個父視圖 SuperView * sView = [[SuperView alloc]init]; sView.frame = CGRectMake(20, 20, 180, 280); //父視圖調用函數創建四個小視圖 [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:@"縮小" forState:UIControlStateNormal]; [btn02 addTarget:self action:@selector(pressSmall) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn02]; sView.tag = 101;}//放大父視圖-(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];}//縮小父視圖-(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 以上代碼書寫完畢，就達到了上面視圖的效果，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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