使用三元组宏方法调用编译器错误

Question

编译器标记我的三元运算符并表示它期望]而不是kGraySquare。 我做错了什么？

#define kGreenSquare [UIImage imageNamed@"distance_on"]
#define kGraySquare [UIImage imageNamed@"distance_off"]

@implementation DistanceIndicatorView
{
    NSMutableArray<UIImageView*>*items;
}


- (void)drawRect:(CGRect)rect {
     items = [[NSMutableArray<UIImageView*> alloc] initWithCapacity:10];
     NSInteger offset = 0;
    for (int i = 0; i<10; i++){
        [items addObject:[[UIImageView alloc]  initWithFrame:CGRectMake(offset, 0, 8, 8)]];
        [items[i] setImage:_distance<i?kGreenSquare:kGraySquare];
         offset += 10;
    }

}

Answer 1

您错过了:

添加冒号（:)＆amp;如下更新

#define kGreenSquare [UIImage imageNamed:@"distance_on"]
#define kGraySquare [UIImage imageNamed:@"distance_off"]

这样可以正常工作。