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instance_methods

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ios - xcode 4.6 中的 "Receiver type for instance messages is a forward declaration"

我想在我的ViewController中调用C++类。所以我创建了一个这样的类:你好.h#import@interfaceHello:NSObject{classNewHello{private:intgreeting_text;public:NewHello(){greeting_text=5;}voidsay_hello(){printf("Greeting_Text=%d",greeting_text);}};NewHello*hello;}-(void)sayHellooooo;@end你好.mm#import"Hello.h"@implementationHello-(voi

ios - xcode 4.6 中的 "Receiver type for instance messages is a forward declaration"

我想在我的ViewController中调用C++类。所以我创建了一个这样的类:你好.h#import@interfaceHello:NSObject{classNewHello{private:intgreeting_text;public:NewHello(){greeting_text=5;}voidsay_hello(){printf("Greeting_Text=%d",greeting_text);}};NewHello*hello;}-(void)sayHellooooo;@end你好.mm#import"Hello.h"@implementationHello-(voi

ios - 崩溃-[AVPlayerItem _attachToPlayer :] An AVPlayerItem cannot be associated with more than one instance of AVPlayer

我有一个崩溃影响了我大约10%的用户,但我无法重现它,并且不知道发生这种情况的确切时间。Crashlytics报告说,大约一半的崩溃用户没有关注应用程序,即做背景音频或AirPlay。该应用程序播放HLS视频流,并在后台切换到纯音频版本。有什么问题吗,或者为什么我的单例Player类中会有多个AVPlayer实例?谢谢!ExceptionType:NSInvalidArgumentExceptionReason:AnAVPlayerItemcannotbeassociatedwithmorethanoneinstanceofAVPlayerFatalExceptionLatestCra

ios - 崩溃-[AVPlayerItem _attachToPlayer :] An AVPlayerItem cannot be associated with more than one instance of AVPlayer

我有一个崩溃影响了我大约10%的用户,但我无法重现它,并且不知道发生这种情况的确切时间。Crashlytics报告说,大约一半的崩溃用户没有关注应用程序,即做背景音频或AirPlay。该应用程序播放HLS视频流,并在后台切换到纯音频版本。有什么问题吗,或者为什么我的单例Player类中会有多个AVPlayer实例?谢谢!ExceptionType:NSInvalidArgumentExceptionReason:AnAVPlayerItemcannotbeassociatedwithmorethanoneinstanceofAVPlayerFatalExceptionLatestCra

iPhone/iOS : Will there be called any method if a UIView is added as a subview

如果我像这样添加一个View作为subview[self.viewaddSubview:mySubview];是否会在mySubview上调用任何方法,我可以重写以添加一些自定义行为? 最佳答案 将View添加到(新的)父View触发器-(void)willMoveToSuperview:(UIView*)newSuperview和-(void)didMoveToSuperview。参见UIViewReference了解更多。 关于iPhone/iOS:Willtherebecalled

iPhone/iOS : Will there be called any method if a UIView is added as a subview

如果我像这样添加一个View作为subview[self.viewaddSubview:mySubview];是否会在mySubview上调用任何方法,我可以重写以添加一些自定义行为? 最佳答案 将View添加到(新的)父View触发器-(void)willMoveToSuperview:(UIView*)newSuperview和-(void)didMoveToSuperview。参见UIViewReference了解更多。 关于iPhone/iOS:Willtherebecalled

iphone 通知结果为 "unrecognized selector sent to instance..."

简而言之,我在ClassA(在viewDidLoad中)注册了以下NSNotification监听器:[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(playSong)name:@"playNotification"object:nil];我在ClassA.h中声明了选择器:-(void)playSong:(NSNotification*)notification;实现如下:-(void)playSong:(NSNotification*)notification{NSString*theTi

iphone 通知结果为 "unrecognized selector sent to instance..."

简而言之,我在ClassA(在viewDidLoad中)注册了以下NSNotification监听器:[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(playSong)name:@"playNotification"object:nil];我在ClassA.h中声明了选择器:-(void)playSong:(NSNotification*)notification;实现如下:-(void)playSong:(NSNotification*)notification{NSString*theTi

ios - [__NSDictionaryI setObject :forKey:]: unrecognized selector sent to instance

我正在尝试将“dateTime”添加到我的字典中,定义如下:SymptomRanking:{5111ef19253b4a9150000000=1;5111f029253b4add4e000000=1;5111f036253b4a123d000001=1;5111f045253b4a404f000000=1;}NSLog(@"dateselected:%@",[[self.datePickerdate]description])[self.resultssetObject:[[self.datePickerdate]description]forKey:@"dateTime"];应用程序

ios - [__NSDictionaryI setObject :forKey:]: unrecognized selector sent to instance

我正在尝试将“dateTime”添加到我的字典中,定义如下:SymptomRanking:{5111ef19253b4a9150000000=1;5111f029253b4add4e000000=1;5111f036253b4a123d000001=1;5111f045253b4a404f000000=1;}NSLog(@"dateselected:%@",[[self.datePickerdate]description])[self.resultssetObject:[[self.datePickerdate]description]forKey:@"dateTime"];应用程序