方法三:代码块
根视图代码:
//.m文件
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor redColor];
[self createButton];
}
- (void)createButton
{
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(10, 30, 300, 40);
[btn setTitle:@"进入下一个视图控制器"forState:UIControlStateNormal];
btn.layer.cornerRadius = 5;
btn.backgroundColor = [UIColor blackColor];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick
{
Sub1ViewController * sub1 = [[Sub1ViewController alloc]init];
sub1.view.backgroundColor = [UIColor blueColor];
sub1.MyBlock = ^(UIColor * color)
{
self.view.backgroundColor = color;
};
[self presentViewController:sub1 animated:YES completion:nil];
}
子视图代码
//.h文件
@interface Sub1ViewController : UIViewController
@property (copy,nonatomic,readwrite)void(^MyBlock)(UIColor * color);
@end
//.m文件
- (void)viewDidLoad
{
[super viewDidLoad];
[self createPopToRootViewBtn];
}
- (void)createPopToRootViewBtn
{
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(10, 30, 300, 40);
[btn setTitle:@"进入根视图控制器"forState:UIControlStateNormal];
btn.layer.cornerRadius = 5;
btn.backgroundColor = [UIColor blackColor];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick
{
_MyBlock([UIColor orangeColor]);
[self dismissViewControllerAnimated:YES completion:nil];
}
方法四:代理-协议
根视图代码
//.h
#import
#import "Sub1ViewController.h"
@interface ViewController : UIViewController
@end
//.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor redColor];
[self createButton];
}
- (void)createButton
{
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(10, 30, 300, 40);
[btn setTitle:@"进入下一个视图控制器"forState:UIControlStateNormal];
btn.layer.cornerRadius = 5;
btn.backgroundColor = [UIColor blackColor];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick
{
Sub1ViewController * sub1 = [[Sub1ViewController alloc]init];
sub1.view.backgroundColor = [UIColor blueColor];
sub1.delegate = self;
[self presentViewController:sub1 animated:YES completion:nil];
}
- (void)changeColor:(UIColor *)color
{
self.view.backgroundColor = color;
}
子视图控制器
//.h文件
#import
@protocol Sub1ViewControllerDelete
- (void)changeColor:(UIColor *)color;
@end
@interface Sub1ViewController : UIViewController
@property (assign,nonatomic,readwrite)id delegate;
@end
//.m文件
- (void)viewDidLoad
{
[super viewDidLoad];
[self createPopToRootViewBtn];
}
- (void)createPopToRootViewBtn
{
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(10, 30, 300, 40);
[btn setTitle:@"进入根视图控制器"forState:UIControlStateNormal];
btn.layer.cornerRadius = 5;
btn.backgroundColor = [UIColor blackColor];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick
{
[_delegate changeColor:[UIColor orangeColor]];
[self dismissViewControllerAnimated:YES completion:nil];
}
方法一：通知中心
发布通知消息postNotificationName消息的名字userInfo传的参数可有可无
NSDictionary*dic = [[NSDictionaryalloc]initWithObjectsAndKeys:numStr,@"messageNumber",nil];
[[NSNotificationCenterdefaultCenter]postNotificationName:@"message"object:nil userInfo:dic];
接收通知中心消息 @selector(myMessage:)调用的方法
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(myMessage:)name:@"message"object:nil];
- (void)registUserName:(NSNotification*)userName
{
NSLog(@"username%@",[userName.userInfoobjectForKey:@"userName"]);
loginLabel.text= [userName.userInfoobjectForKey:@"userName"];
}