不知道为什么会收到“函数调用中缺少前哨？”
NSMutableArray *kkk = [NSMutableArray arrayWithObjects: @"a", @"b", @"cat", @"dog", nil];
ppp = [NSMutableArray arrayWithCapacity:3];
[ppp addObject:[[NSMutableArray alloc] initWithObjects: kkk]]; // <<--- Missing sentinel in function call
[ppp addObject:[[NSMutableArray alloc] initWithObjects: kkk, nil]]; //<<--- change, but it falls out
NSLog(@"Working: %@ %@", [[ppp objectAtIndex:0] objectAtIndex:3], [[ppp objectAtIndex:0] objectAtIndex:2] );
最佳答案
initWithObjects:必须以结尾的nil终止。由于它是单个对象，因此您应该能够使用initWithObject:。也就是说，您将像这样泄漏数组。做
[ppp addObject:[NSMutableArray arrayWithObject:kkk]];
这里的代码还有一个问题，
NSMutableArray *kkk = [NSMutableArray arrayWithObjects: @"a", @"b", @"cat", @"dog", nil];
ppp = [NSMutableArray arrayWithCapacity:3];
[ppp addObject:[[NSMutableArray alloc] initWithObjects: kkk, nil]];
您正在创建三维数组。所以
NSLog(@"Working: %@ %@", [[ppp objectAtIndex:0] objectAtIndex:3], [[ppp objectAtIndex:0] objectAtIndex:2] );
是错的。
NSLog(@"Working: %@ %@", [[[ppp objectAtIndex:0] objectAtIndex:0] objectAtIndex:3], [[[ppp objectAtIndex:0] objectAtIndex:0] objectAtIndex:2] );
应该记录正确的值。
但是，如果您需要基于log语句的二维数组，我会说您需要这样做，
[ppp addObject:kkk];
关于objective-c - 在函数调用中缺少哨兵？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6702564/