QCView无法从文件加载石英成分

Question

我正在通过以下代码从文件加载Quartz合成：

// 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];

我收到错误：

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

（文件存在于位置，从IB加载文件在IB内部运行，但在运行应用程序时不运行）

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

Answer 1

工作目录可能不是您认为的那样。尝试使用绝对路径引用它。

例如，假设qtz文件位于bundle的Resources文件夹中：

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