Question

我正在尝试通过Interface Builder在成员变量中缓存NSTextField的背景颜色集，以便以后在另一个组件中使用。启动时，NSTextField的背景颜色设置为透明。

@implementation CTTextField

- (id)initWithCoder:(NSCoder*)coder {
    self = [super initWithCoder:coder];
    if (self) {
        [self customize];
    }
    return self;
}

- (id)initWithFrame:(NSRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self customize];
    }
    return self;
}

- (void)awakeFromNib {
    ...
    [self customize];
}

- (void)customize {
    // Store the user defined background color.
    // FIXME: The color is not stored.
    m_userDefinedBackgroundColor = self.backgroundColor;
    // Disable the background color.
    self.backgroundColor = [NSColor colorWithCalibratedWhite:1.0f alpha:0.0f];
    ...
}

@end

但是，m_userDefinedBackgroundColor始终为黑色我正在处理的整个CocoaThemes project可以在GitHub上找到。

Answer 1

您的-customize方法被调用两次。当nib加载时，所有对象都使用-initWithCoder:进行初始化，然后接收-awakeFromNib。您应该删除-initWithCoder:或-awakeFromNib或m_userDefinedBackgroundColor nil -customize，如下所示：

- (void)customize {
    // Store the user defined background color.
    // FIXME: The color is not stored.

    if (m_userDefinedBackgroundColor == nil)
        m_userDefinedBackgroundColor = self.backgroundColor;

    // Disable the background color.
    self.backgroundColor = [NSColor colorWithCalibratedWhite:1.0f alpha:0.0f];
    ...
}

无法通过Interface Builder存储NSTextField的背景颜色

1 个答案: