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今天一個很變態的問題卡住了：cannot find protocol declaration for "RefreshAudioListViewDelegate"<p></p><p><span style="color: rgb(186, 45, 162); font-family: Menlo; font-size: 11px; ">1.在PlayerController.h</span>自定義了 一個代理 <span style="font-family: Menlo; font-size: 11px; ">RefreshAudioListViewDelegate</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; color: rgb(209, 46, 27); ">
</p><pre name="code" class="html">#import "<span style="font-family: Menlo; font-size: 11px; ">PlayerListViewController.h</span>"
@protocol RefreshAudioListViewDelegate <NSObject>
- (void) updateCurrentPlayedAudio:(NSUInteger) currentPlayedIndex;
@end www.2cto.com
@interface PlayerController : NSObject</pre>
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2.在<span style="font-family:Menlo; font-size:11px">PlayerListViewController.h中</span>
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<pre name="code" class="html">#import "PlayerController.h"
@class PlayerController;
@interface PlayerListViewController : UIViewController< RefreshAudioListViewDelegate>
{
PlayerController *playerController;
}</pre><br>
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編譯器提示“cannot find protocol declaration for "RefreshAudioListViewDelegate”</p>
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分析原因：</p>
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<span style="font-family:Menlo">在編譯器編譯順序：</span></p><pre name="code" class="html" style="font-family: Menlo; "><span style="font-family: Menlo; font-size: 11px; ">1.PlayerListViewController.h文件時，首先發現#import "PlayerController.h",編譯器會跑到PlayerController.h中。</span></pre><pre name="code" class="html" style="font-family: Menlo; "><span style="font-family: Menlo; font-size: 11px; ">2.在PlayerController.h中首先發現#import "PlayerListViewController.h"，編譯器又會到PlayerListViewController中加載內容。</span></pre><pre name="code" class="html"><span style="font-size: 11px; "><span style="font-family:Menlo;">3.這時 當見到</span></span><pre name="code" class="html" style="font-family: Menlo; ">@interface PlayerListViewController : UIViewController< RefreshAudioListViewDelegate>這一句的時候，由於在PlayerController中定義代理的語句還沒有加載，所以編譯器會報錯：</pre><pre name="code" class="html"><pre name="code" class="html" style="font-family: Menlo; ">cannot find protocol declaration for "RefreshAudioListViewDelegate"</pre><pre name="code" class="html" style="font-family: Menlo; "></pre><pre name="code" class="html"><span style="font-family:Menlo;">解決辦法：</span></pre><pre name="code" class="html"><span style="font-family:Menlo;">刪除PlayerController.h中的</span><pre name="code" class="html">#import "<span style="font-family: Menlo; font-size: 11px; ">PlayerListViewController.h</span>"</pre><p></p>
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