在使用委托的ObjectiveC中，如何在不使用UIButton的情况下发送消息? [英] In ObjectiveC using delegate how do I send a message without using a UIButton?

问题描述

我最近学会了只要按下按钮，就可以使用委托将消息从一个类发送到另一类，并且我想了解如何在不执行按钮操作的情况下发送消息. Apple文档提示一种可能的方法是 performSelector:(SEL)aSelector; ，但是尝试使用它时我没有运气.相反，这是我尝试过的.

I recently learned to use delegates to send messages from one class to another whenever a button is pressed and I'd like to find out how to send a message without a button action. Apple documentation suggests a likely method is performSelector:(SEL)aSelector; but I had no luck when I tried to use it. Instead, this is what I tried.

在 MicroTune.h 中，我定义了一个委托并为其赋予了属性

In MicroTune.h, I defined a delegate and gave it a property

    @class Synth;

    @protocol TuningDelegate <NSObject>
        -(void)setTuning:(NSData *)tuningData;
    @end

    @interface MicroTune : NSObject
        {
        …
        }

    @property (assign) id<TuningDelegate> delegate;
    @end

在 Synth.h 中，我声明了该类，以便其充当委托人

In Synth.h, I declared the class so it acts as a delegate

    #import "MicroTune.h"

    @interface Synth : NSObject <TuningDelegate>

在 Synth.m 中，我创建了一种方法，让我知道消息已到达

and in Synth.m, I created a method to let me know the message arrived

    #import "Synth.h"

    - (void)setTuning:(NSData *)tuningData
    {
        NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:tuningData];
        NSLog(@" hip hip %@", array);
    }

编辑

而且，同样在Synth.m中，为了确保能够识别出该委托人，我添加了以下内容

And, also in Synth.m, to make sure the delegate is recognised, I added the following

    - (id)initWithSampleRate:(float)sampleRate_ 
        { if ((self = [super init])) 
            { 
                microTuneClassObject.delegate = self;

                // etc. etc.

            } return self; 
        }
                    (Use of undeclared identifier 'microTuneClassObject')

并且也尝试过

    MicroTune.delegate = self;
        (Property 'delegate' not found on object of type 'MicroTune')

和

    self.MicroTune.delegate = self;
        (Property 'MicroTune' not found on object of type 'Synth *')

---

最后，在 MicroTune.m 中，我定义了一种发送消息的方法

---

And finally, in MicroTune.m, I defined a method to send the message

    #import "MicroTune.h"

    - (void)sendTuning:(NSData *)tuningData 
    {
        [synthLock lock];
        [self.delegate setTuning:(NSData *)tuningData];
        [synthLock unlock];
    }

但是Xcode给出了以下消息.

but Xcode gave the following message.

      No type or protocol named 'TuningDelegate'

有人可以解释一下我发送邮件需要做什么吗?谢谢.

Can someone kindly explain what I need to do to send the message ? Thanks.

结论

该解决方案可以在我的补充答案中找到.

The solution can be found in my supplementary answer.

推荐答案

在 MicroTune.h 文件中，

代替 #import"Synth.h" 编写 @class Synth

这篇关于在使用委托的ObjectiveC中，如何在不使用UIButton的情况下发送消息?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！