IOS四种反向传值的方法
方法一:使用target-action设计模式
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代码如下:(由根视图推出子视图,再由子视图推出根视图,在推出根视图时,子视图传一个color的属性给根视图,用来修改根视图的背景颜色)
根视图控制器代码:
//.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.target = self;
sub1.action = @selector(changeColor:);
[self presentViewController:sub1 animated:YES completion:nil];
}
- (void)changeColor:(UIColor *)color
{
self.view.backgroundColor = color;
}子视图代码:
//.h文件
@interface Sub1ViewController : UIViewController
@property (assign,readwrite,nonatomic)id target;
@property (assign,readwrite,nonatomic)SEL action;
@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
{
if ([_target respondsToSelector:_action])
{
[_target performSelector:_action withObject:[UIColor orangeColor]];
}
[self dismissViewControllerAnimated:YES completion:nil];
}方法二:通知
//.m根视图
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor redColor];
[self createButton];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeColor:) name:@"ChangeColor" object:nil];
}
- (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];
[self presentViewController:sub1 animated:YES completion:nil];
}
- (void)changeColor:(NSNotification *)nofi
{
self.view.backgroundColor = [nofi.userInfo objectForKey:@"color"];
}子视图代码
- (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];
[[NSNotificationCenter defaultCenter]postNotificationName:@"ChangeColor" object:self userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor orangeColor],@"color", nil]];
[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick
{
[self dismissViewControllerAnimated:YES completion:nil];
}方法三:代码块
根视图代码:
- (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]; }
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