连接字符串

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'Length.png'？因为[arraySystem objectAtIndex:[countImage intValue]]等于'长度' 它只打印'长度'

Answer 1

在调用stringByAppendingString时输入“oneTextText =”，它应该是：

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