@interface WKInterfaceButton : WKInterfaceObject

- (void)setTitle:(nullable NSString *)title;
- (void)setAttributedTitle:(nullable NSAttributedString *)attributedTitle;

- (void)setBackgroundColor:(nullable UIColor *)color;
- (void)setBackgroundImage:(nullable UIImage *)image;
- (void)setBackgroundImageData:(nullable NSData *)imageData;
- (void)setBackgroundImageNamed:(nullable NSString *)imageName;

- (void)setEnabled:(BOOL)enabled;

@end

typedef NS_ENUM(NSInteger, GSIconPosition) {
    GSIconPositionTop       = 0,
    GSIconPositionLeft,
    GSIconPositionBottom,
    GSIconPositionRight
};

IB_DESIGNABLE
@interface RTIconButton : UIButton
@property (nonatomic, assign) IBInspectable CGFloat iconMargin;
@property (nonatomic, assign) IBInspectable NSInteger iconPosition;
@property (nonatomic, assign) IBInspectable CGSize iconSize;    // default is image size;
@end

- (void)commonInit
{
    self.iconSize = CGSizeZero;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self commonInit];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self commonInit];
    }
    return self;
}

- (CGSize)intrinsicContentSize
{
    CGRect contentRect = [self contentRectForBounds:self.bounds];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated"
    CGSize titleSize = [[self titleForState:self.state] sizeWithFont:self.font];
#pragma clang diagnostic pop
    CGSize imageSize = CGSizeEqualToSize(self.iconSize, CGSizeZero) ? [super imageRectForContentRect:contentRect].size : self.iconSize;

    switch (_iconPosition) {
        case GSIconPositionTop:
        case GSIconPositionBottom:
            return CGSizeMake(MAX(titleSize.width, imageSize.width), titleSize.height + imageSize.height + self.iconMargin);

            break;
        default:
            return CGSizeMake(titleSize.width + imageSize.width + self.iconMargin, MAX(titleSize.height, imageSize.height));
            break;
    }
}

- (CGSize)sizeThatFits:(CGSize)size
{
    return [self intrinsicContentSize];
}

IB_DESIGNABLE
@interface RSlideView : UIView
// 这里省略了不支持 IB 的属性
@property (nonatomic, assign, getter = isLoopSlide) IBInspectable BOOL loopSlide;
@property (nonatomic, assign, getter = isContinuousScroll) IBInspectable BOOL continuousScroll;
@property (nonatomic, assign, getter = isPageControlHidden) IBInspectable BOOL pageControlHidden;   // Default YES
@property (nonatomic, assign) IBInspectable UIColor *pageControlBackgroundColor;
@property (nonatomic, assign) IBInspectable CGSize pageSize;  // Default to be the RSlideView's size
    // The Gap between two pages, default to be 0
@property (nonatomic, assign) IBInspectable CGFloat pageMargin;
@end

#if TARGET_INTERFACE_BUILDER
- (void)drawRect:(CGRect)rect
{
    // Drawing code
    if (CGSizeEqualToSize(_pageSize, CGSizeZero)) {
        _pageSize = self.bounds.size;
    }
    [self updateVisibalePages];

    CGSize size = CGSizeMake(_pageSize.width + _pageMargin, _pageSize.height);

    CGRect scrollRect = CGRectMake((CGRectGetWidth(self.bounds) - _pageSize.width - _pageMargin) / 2,
                                   (CGRectGetHeight(self.bounds) - _pageSize.height) / 2,
                                   self.pageSize.width + _pageMargin, _pageSize.height);

    NSDictionary *attri = @{NSFontAttributeName: [UIFont systemFontOfSize:13],
                            NSForegroundColorAttributeName: [UIColor darkTextColor]};

    NSInteger start = self.loopSlide ? -_extraPagesForLoopShow : 0;
    for (NSInteger i = start; i <= _extraPagesForLoopShow; ++i) {
        [[UIColor grayColor] setStroke];
        [[UIColor colorWithWhite:0.9 alpha:1.0] setFill];

        CGRect rect = CGRectMake(_pageMargin / 2 + size.width * i,
                                 (size.height - _pageSize.height) / 2,
                                 _pageSize.width, _pageSize.height);
        rect = CGRectOffset(rect, scrollRect.origin.x, scrollRect.origin.y);
        UIBezierPath *path = [UIBezierPath bezierPathWithRect:rect];
        [path stroke];
        [path fill];
        NSString *page = [NSString stringWithFormat:@"Page %s%ld", self.loopSlide && i < 0 ? "N" : "", i];
        CGSize textSize = [page sizeWithAttributes:attri];
        CGPoint textPoint = CGPointMake(CGRectGetMidX(rect) - textSize.width / 2, CGRectGetMidY(rect) - textSize.height / 2);
        [page drawAtPoint:textPoint
           withAttributes:attri];
    }

    self.pageControl.numberOfPages = MIN(10, _extraPagesForLoopShow * 2 + 1);
    self.pageControl.title = @"Page 0";
}
#endif