1. 基本概念
頁(yè)面?zhèn)髦涤卸喾N方式丛肮，今天學(xué)的是通過(guò)屬性傳值和代理傳值趾娃。屬性傳值就是通過(guò)一個(gè)按鈕或者其他的控件加上觸發(fā)函數(shù)傳值。
2. 屬性傳值
刪去ViewController文件，在新建三個(gè)視圖控制器文件袒餐。在AppDelegare中創(chuàng)建window和視圖一和視圖三腰涧，還有一個(gè)工具欄一個(gè)導(dǎo)航欄：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #d12f1b}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #4f8187}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #bb2ca2}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p8 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}span.s1 {font-variant-ligatures: no-common-ligatures; color: #78492a}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s4 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s6 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s9 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}
#import "AppDelegate.h"
#import "VCFirst.h"
#import "VCThird.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
[self.window makeKeyAndVisible];
VCFirst* vcFirst=[[VCFirst alloc]init];
vcFirst.title=@"視圖一";
vcFirst.view.backgroundColor=[UIColor whiteColor];
UINavigationController* nav=[[UINavigationController alloc]initWithRootViewController:vcFirst];
VCThird* vcThird=[[VCThird alloc]init];
vcThird.title=@"視圖三";
vcThird.view.backgroundColor=[UIColor greenColor];
UINavigationController* nav2=[[UINavigationController alloc]initWithRootViewController:vcThird];
NSArray* array=[NSArray arrayWithObjects:nav,nav2,nil];
UITabBarController* tabVC=[[UITabBarController alloc]init];
tabVC.viewControllers=array;
self.window.rootViewController=tabVC;
return YES;
}
然后在視圖一中創(chuàng)建視圖二：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #bb2ca2}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s4 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s5 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s6 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s7 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s8 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s9 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s10 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s11 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}
@implementation VCFirst
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
-(void)changeColor:(UIColor *)color
{
self.view.backgroundColor=color;
}
//創(chuàng)建視圖控制器二
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
VCSecond* vcSecond=[[VCSecond alloc]init];
//將當(dāng)前的控制器作為代理對(duì)象賦值
//delegate相當(dāng)于是vcSecond的屬性
// vcSecond.delegate=self;
vcSecond.title=@"視圖二";
vcSecond.view.backgroundColor=[UIColor purpleColor];
[self.navigationController pushViewController:vcSecond animated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
視圖結(jié)構(gòu)為：
----視圖一 ---->視圖二
----視圖三
這時(shí)在VCFirst中可以直接改變視圖二的顏色勾哩。
3. 代理傳值
這部分主要解決怎么通過(guò)改變視圖二中的代碼思劳，可以控制改變視圖一的顏色。
在視圖二中添加一個(gè)按鈕：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s3 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s4 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s5 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s6 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIBarButtonItem* btnChange=[[UIBarButtonItem alloc]initWithTitle:@"改變顏色" style:UIBarButtonItemStyleDone target:self action:@selector(pressChange)];
self.navigationItem.rightBarButtonItem=btnChange;
}
然后在視圖二的頭文件里定義協(xié)議：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #d12f1b}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #bb2ca2}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}span.s1 {font-variant-ligatures: no-common-ligatures; color: #78492a}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s4 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s5 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s6 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s7 {font-variant-ligatures: no-common-ligatures; color: #4f8187}
#import <UIKit/UIKit.h>
//定義一個(gè)代理協(xié)議
//是視圖控制器二的協(xié)議
@protocol VCSecondDelegate <NSObject>
//定義協(xié)議函數(shù)
-(void)changeColor:(UIColor*)color;
@end
@interface VCSecond : UIViewController
@property(assign,nonatomic)NSInteger tag;
//定義一個(gè)代理對(duì)象
//代理對(duì)象會(huì)執(zhí)行協(xié)議函數(shù)
//通過(guò)代理對(duì)象實(shí)現(xiàn)協(xié)議函數(shù)椒舵，達(dá)到代理對(duì)象改變本身屬性的目的
//代理對(duì)象一定要實(shí)現(xiàn)代理協(xié)議
@property(assign,nonatomic)id<VCSecondDelegate> delegate;
@end
在視圖一創(chuàng)建視圖二的過(guò)程中將視圖一賦值為代理對(duì)象：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}span.s1 {font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}
vcSecond.delegate=self;
完整代碼即
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; min-height: 13.0px}p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #008400}p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #703daa}p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #3d1d81}span.s1 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s4 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s5 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s6 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}span.s7 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s8 {font-variant-ligatures: no-common-ligatures; color: #000000}span.s9 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures}span.s10 {font-variant-ligatures: no-common-ligatures; color: #d12f1b}span.s11 {font: 11.0px 'Heiti SC Light'; font-variant-ligatures: no-common-ligatures; color: #d12f1b}
//創(chuàng)建視圖控制器二
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
VCSecond* vcSecond=[[VCSecond alloc]init];
//將當(dāng)前的控制器作為代理對(duì)象賦值
//delegate相當(dāng)于是vcSecond的屬性
vcSecond.delegate=self;
vcSecond.title=@"視圖二";
vcSecond.view.backgroundColor=[UIColor purpleColor];
[self.navigationController pushViewController:vcSecond animated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
最后去視圖二中實(shí)現(xiàn)按鈕觸發(fā)函數(shù)：
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px 'Heiti SC Light'; color: #008400}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}span.s1 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures}span.s2 {font-variant-ligatures: no-common-ligatures}span.s3 {font-variant-ligatures: no-common-ligatures; color: #bb2ca2}span.s4 {font: 11.0px Menlo; font-variant-ligatures: no-common-ligatures; color: #000000}span.s5 {font-variant-ligatures: no-common-ligatures; color: #4f8187}span.s6 {font-variant-ligatures: no-common-ligatures; color: #31595d}span.s7 {font-variant-ligatures: no-common-ligatures; color: #703daa}span.s8 {font-variant-ligatures: no-common-ligatures; color: #3d1d81}
//點(diǎn)擊按鈕時(shí)觸發(fā)事件
-(void)pressChange
{
//代理對(duì)象調(diào)用事件函數(shù)
[_delegate changeColor:[UIColor redColor]];
}
最終效果：
屏幕快照 2016-12-08 上午11.04.57.png
屏幕快照 2016-12-08 上午11.05.06.png
屏幕快照 2016-12-08 上午11.05.13.png
