QCView無法從文件

Question

我加載從文件中石英組成，通過這個代碼加載石英組成：

// quartz is a QCView in the XIB file 
QCComposition *qc = [QCComposition compositionWithFile:@"res/wdq.qtz"]; 
//NSLog(@"input keys %@",[qc inputKeys]); 
//NSLog(@"copyright %@",[[qc attributes] valueForKey:QCCompositionAttributeCopyrightKey]); 
[quartz loadComposition:qc]; 

，我得到的錯誤：

*** <QCComposition = 0x100258d80 | identifier = "(null)" | source = (null) | backing = "res/wdq.qtz": Failed loading composition 

（文件存在的位置，從IB加載文件在IB內工作，但在運行應用程序時不能運行）

Mac OS X Lion 10.7.3 | XCode 4.2 | Quartz Composer 4.5

Answer 1

工作目錄可能不是你認爲的那樣。嘗試使用絕對路徑引用它。

例如，假設QTZ文件在包的資源文件夾：

NSString *path = [[NSBundle mainBundle] pathForResource:@"wdq" ofType:@"qtz" inDirectory:@"res"]]l 
QCComposition *qc = [QCComposition compositionWithFile:path];