如何仅在UIButton中为标题的特定部分设置图像

Question

I have a UIButton that has a title. Consider it as Thu 20. There is an image which is set as the background for the button,this image is width resized and content mode is aspect fit.So it appears to the full button. My problem: I need the image only for the "20" part and not the entire "Thu 20". if you see the iPad calendar you will get the point. How can i do it? Thanks

Answer 1

Unless something like an attributed string has a functionality of putting a rectangle around some text I suggest you to create a custom view that handles this:

You would need a view that excepts 2 strings, a normal one and the one in the rectangle. Then insert a normal label, set the text, call sizeToFit. Then add the second label and do the same as first but in the end place it right next to the first label. Then add the image view onto the label respecting the labels dimensions. Then resize the whole view to fit all the views on it. Now you can add this custom label to a button or anywhere you want it...

Answer 2

我宁愿建议您放置一个包含图像的图像，然后在图像顶部放置一个标签，并在其上加上“ 20”，然后将一个自定义的UIButton放置在没有backGround颜色的情况下，并将两者都放置在顶部

Answer 3

With a bit of work you could override one of these UIButton methods to place the image at the correct location. Using a method within UILabel to determine the coordinates of "20" would give the the location for the image.

class UIButton {

    // these return the rectangle for the background (assumes bounds), the content (image + title) and for the image and title separately. the content rect is calculated based
    // on the title and image size and padding and then adjusted based on the control content alignment. there are no draw methods since the contents
    // are rendered in separate subviews (UIImageView, UILabel)

    open func backgroundRect(forBounds bounds: CGRect) -> CGRect

    open func contentRect(forBounds bounds: CGRect) -> CGRect

    open func titleRect(forContentRect contentRect: CGRect) -> CGRect

    open func imageRect(forContentRect contentRect: CGRect) -> CGRect
}

See Apple's Documentation under "Getting Dimensions" for more information about these methods.