NSARRAY编码错误

Question

任何人都可以注意到在这种编码错误？

NSString *textFilePath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"txt"]; 
NSString *fileContents = [NSString stringWithContentsOfFile:textFilePath encoding:NSUTF8StringEncoding error:NULL]; 
practiceContent = [fileContents componentsSeparatedByString:@" "]; 

myScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 
myScrollView.contentSize = CGSizeMake(320,960); 
myScrollView.pagingEnabled = FALSE; 
myScrollView.scrollEnabled = TRUE; 
myScrollView.backgroundColor = [UIColor whiteColor]; 
[self.view addSubview:myScrollView]; 

UILabel *lblText = [[UILabel alloc] initWithFrame:CGRectMake(0,100,960,40)]; 
lblText.text = practiceContent; 
[myScrollView addSubview:lblText]; 
[lblText release]; 

我试图从文本的text.txt进入的标签上滚动型...它没有显示出错误时，它编译...

在此先感谢

Answer 1

practiceContent = [fileContents componentsSeparatedByString:@" "]; 
... 
lblText.text = practiceContent; 

practiceContent是一个NSArray，但lblText.text需要一个NSString。你只要简单地写

lblText.text = fileContents; 

编译器不抱怨，可能是你已经声明practiceContent作为id原因。如果类型为id，编译器无法执行编译时类型检查。