级联字符串

Question

NSMutableArray * oneText = [[NSMutableArray alloc] init]; 
[oneText addObject:[arraySystem objectAtIndex:[countImage intValue]]]; 
[oneText addObject:@".png"]; 
NSString *oneTextText=[oneText objectAtIndex:0]; 
[oneTextText stringByAppendingString:[oneText objectAtIndex:1]]; 
NSLog(oneTextText); 

为什么上面的代码不能打印'Lenght.png'？作为[arraySystem objectAtIndex:[countImage intValue]]等于“Lenght” 只会打印“Lenght”

Answer 1

把“oneTextText =”呼叫stringByAppendingString的时候，它应该是：

oneTextText = [oneTextText stringByAppendingString:[oneText objectAtIndex:1]];