NSARRAY编码错误

Question

任何人都可以注意到这个编码中的错误吗？

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];

我正在尝试将text.txt中的文本传递到scrollview上的标签中...它在编译时没有显示错误...

提前致谢

Answer 1

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

practiceContent是NSArray，但lblText.text需要NSString。你应该写一下

lblText.text = fileContents;

编译器没有抱怨的原因可能是您已将practiceContent声明为id。如果类型为id，则编译器无法执行编译时类型检查。