传值方式
//单例//.h+ (Instannce *)shareInstance;//.mstatic Instannce *instance = nil;@implementation Instannce//定义一个创建单例对象的方法+ (Instannce *)shareInstance { if (instance == nil) { instance = [[Instannce alloc] init]; } return instance;}//使用alloc的时候调用的方法instancetype+ (id)allocWithZone:(struct _NSZone *)zone { if (instance == nil) { instance = [super allocWithZone:zone]; } return instance;}- (id)copy { return self;}- (id)retain { return self;}- (NSUInteger)retainCount { //返回无符号最大值 return UINT_MAX;}- (oneway void)release { //什么也不做}//代理//.h@protocol GetMessageProtocol <NSObject >- (void)getNum:(NSString *)num withPassWord:(NSString *)pass;@end@property (nonatomic,assign) id<GetMessageProtocol> delegate;//.mif ([self.delegate respondsToSelector:@selector(getNum:withPassWord:)]) { [self.delegate getNum:num.text withPassWord:passWord.text]; }#pragma mark - GetMessageProtocol- (void)getNum:(NSString *)num withPassWord:(NSString *)pass { }registerCtrl.delegate = self;//通知 注意postNotificationName 必须一致 [[NSNotificationCenter defaultCenter] postNotificationName:NotificationName object:self userInfo:dic]; //dic存放在userinfo中 dic中存放要传过去的值是个字典//接受通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeAction:) name:NotificationName object:nil];//KVO监听/*KVO观察者方法 keyPath: 监听的属性名 object： 被观察的对象 change: 属性值 context: 上下设备文 */ [registerCtrl addObserver:self forKeyPath:@"属性名称1" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:nil]; [registerCtrl addObserver:self forKeyPath:@"属性名称2" options:NSKeyValueObservingOptionNew context:nil];//触发的事件- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { //object的值是registerCtrl if ([keyPath isEqualToString:@"属性名称1"]) { }else if ([keyPath isEqualToString:@"属性名称2"]) { } }//.h@property (nonatomic, copy) NSString *属性名称1;@property (nonatomic, copy) NSString *属性名称2;//.m 必须通过setter方法改变值或者KVC//KVO方式//触发的事件[indexCollectionView addObserver:self forKeyPath:@"属性名称" options:NSKeyValueObservingOptionNew context:nil]; [posterCollectionView addObserver:self forKeyPath:@"pathIndex" options:NSKeyValueObservingOptionNew context:nil];- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { //得到改变后的新值 NSInteger index = [[change objectForKey:@"new"] integerValue]; }}//Block block的返回值 block的名称 block的参数 typedef void(^SucccessBlock)(NSString *); //Block的定义@property(nonatomic,copy)SucccessBlock loginBlock; //block的声明 要用copy防止block的循环引用_freindBlcok(friends); block的调用[[MyXMPPManager shareManager] getFreind:^(NSArray *freinds) {} //block的赋值 实现原标题：iOS 各种传值方式
关键词：IOS
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