Format指定类型'int'但参数的类型为'UIViewContentMode'

Question

我在Xcode中收到警告：

  

Format指定类型'int'但参数具有类型   'UIViewContentMode'

我有一个方法可用于调整UIImage的大小，如下所示：

- (UIImage *)resizedImageWithContentMode:(UIViewContentMode)contentMode
                                  bounds:(CGSize)bounds
                    interpolationQuality:(CGInterpolationQuality)quality {
    CGFloat horizontalRatio = bounds.width / self.size.width;
    CGFloat verticalRatio = bounds.height / self.size.height;
    CGFloat ratio;

    switch (contentMode) {
        case UIViewContentModeScaleAspectFill:
            ratio = MAX(horizontalRatio, verticalRatio);
            break;

        case UIViewContentModeScaleAspectFit:
            ratio = MIN(horizontalRatio, verticalRatio);
            break;

        default:
            [NSException raise:NSInvalidArgumentException format:@"Unsupported content mode: %d", contentMode];
    }
...

UIViewContentMode似乎引用了一个Integer，所以我不确定这个警告：

typedef NS_ENUM(NSInteger, UIViewContentMode) {
    UIViewContentModeScaleToFill,
    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent
    UIViewContentModeScaleAspectFill, ... 

我怎样摆脱这个警告似乎不正确？异常中的NSLog是否正确？

Answer 1

您可以将NSInteger UIViewContentMode投射到这样的int：

[NSException raise:NSInvalidArgumentException format:@"Unsupported content mode: %d", (int)contentMode];