NSARRAY編碼錯誤

Question

任何人都可以注意到在這種編碼錯誤？

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]; 

我試圖從文本的text.txt進入的標籤上滾動型...它沒有顯示出錯誤時，它編譯...

在此先感謝

Answer 1

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

practiceContent是一個NSArray，但lblText.text需要一個NSString。你只要簡單地寫

lblText.text = fileContents; 

編譯器不抱怨，可能是你已經聲明practiceContent作爲id原因。如果類型爲id，編譯器無法執行編譯時類型檢查。