Objective-C------- 传值总结
一、属性传值
A界面->B界面传值
B_界面.h文件(接收者)
B界面.h
//1.声明属性
@property (nonatomic, copy) NSString *bString;
A_界面.m文件(发送者)
A界面.m
//2.属性传值
BViewController *bVC = [BViewController new];
bVC.bString = @"A";
[self.navigationController pushViewController:bVC animated:YES];
B_界面.m文件(接收者)
B界面.m
//3.结果
NSLog(@"A界面→B界面:%@", self.bString);
//输出: A界面→B界面:A
二、方法传值
A界面->B界面传值
B_界面.m文件(接收者)
B界面.m
//1.自定义初始化方法
- (instancetype)initWithOne:(NSString *)one Two:(CGFloat)two{
self = [super init];
if (self) {
//4.结果
NSLog(@"A界面→B界面:%@ %.2f", one, two);
//输出: A界面→B界面:A 99.90
}
return self;
}
B_界面.h文件(接收者)
B界面.h
//2.声明初始化方法
- (instancetype)initWithOne:(NSString *)one Two:(CGFloat)two;
A_界面.m文件(发送者)
A界面.m
//3.方法传值
BViewController *bVC = [[BViewController alloc] initWithOne:@"A" Two:99.9];
[self.navigationController pushViewController:bVC animated:YES];
三、代理传值
B界面->A界面传值
B_界面.h文件(发送者)
B界面.h
#import
//1.声明协议和代理方法
@protocol BViewControllerDelegate
- (void)protocolSendValue:(NSString *)value;
@end
@interface BViewController : UIViewController
//2.设置代理(ARC用weak,MRC用assign)
@property (nonatomic, weak) id myDelegate;
@end
B_界面.m文件(发送者)
B界面.m
//3.让代理执行代理方法(代理传值)
[self.myDelegate protocolSendValue:@"B"];
A_界面.m文件(接收者)
A界面.m
//4.签订代理协议
@interface AViewController ()
@end
- (void)viewDidLoad {
[super viewDidLoad];
//5.指定代理
BViewController *bVC = [BViewController new];
bVC.myDelegate = self;
[self.navigationController pushViewController:bVC animated:YES];
}
#pragma mark -BViewControllerDelegate
//6.实现代理方法(结果)
- (void)protocolSendValue:(NSString *)value{
NSLog(@"B界面→A界面:%@", value);
//输出: B界面→A界面:B
}
四、Block传值
B界面->A界面传值
注:Block中要防止在文件中循环引用
B_界面.h文件(发送者)
B界面.h
//1.声明Block属性
typedef void(^ValueBlock)(NSString *);
@interface BViewController : UIViewController
@property (nonatomic, copy) ValueBlock valueBlock;
@end
B_界面.m文件(发送者)
B界面.m
//2.Block传值(代码块属性不为空)
if (self.valueBlock) {
self.valueBlock(@"B");
}
A_界面.m文件(接收者)
A界面.m
BViewController *bVC = [BViewController new];
[self.navigationController pushViewController:bVC animated:YES];
//3.结果(Block中要防止在文件中循环引用)
//__weak typeof(self) weakSelf = self;
bVC.valueBlock = ^(NSString *string){
NSLog(@"B界面→A界面:%@", string);
//输出: B界面→A界面:B
};
五、通知中心传值
任意界面->A界面
注:发送者和接收者name参数必须保持一致
A_界面.m文件(接收者)
A界面.m
//1.注册通知
- (void)viewDidLoad {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(acceptNotification:) name:@"noticeSendValue" object:nil];
CViewController *cVC = [CViewController new];
[self.navigationController pushViewController:cVC animated:YES];
}
//2.销毁通知
- (void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"noticeSendValue" object:nil];
}
//4.结果
- (void)acceptNotification:(NSNotification*)notification{
NSLog(@"%@", notification.userInfo);
//输出: {name = text;}
}
C_界面.m(发送者)
C界面.m
//3.通知传值
[[NSNotificationCenter defaultCenter] postNotificationName:@"noticeSendValue" object:self userInfo:@{@"name": @"text"}];
六、单例传值
A界面->任意界面
使用单例模式,编写ValueManager单例类来存储数据
ValueManager.h文件(全局唯一)
//////////单例.h//////////
@interface ValueManager : NSObject
+ (ValueManager *)shareValueManager;
@property (nonatomic, copy) NSString *strValue;
@end
ValueManager.m文件(全局唯一)
//////////单例.m//////////
+ (ValueManager *)shareValueManager{
static ValueManager *shareValueManager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shareValueManager = [ValueManager new];
});
return shareValueManager;
}
A_界面.m文件(发送者)
//////////A界面.m//////////
//2.单例传值(存值)
ValueManager *valueManager = [ValueManager shareValueManager];
valueManager.strValue = @"Singleton";
C_界面.m文件(接收者)
//////////C界面.m//////////
//3.结果(取值)
ValueManager *valueManager = [ValueManager shareValueManager];
NSLog(@"%@", valueManager.strValue);
//输出: Singleton
七、NSuserDefault传值
A界面->任意界面
A_界面.m文件(发送者)
//////////A界面.m//////////
//1.NSuserDefault传值(存值)
[[NSUserDefaults standardUserDefaults] setObject:@"NSUserDefaults" forKey:@"name"];
[[NSUserDefaults standardUserDefaults] synchronize];
C_界面.m文件(接收者)
//////////C界面.m//////////
//2.取值
NSLog(@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@"name"]);
//输出: NSUserDefaults
