版本记录

前言

回顾

上一篇主要介绍了UIButton分类image部分，这一篇主要看一下UIButton分类background image部分。

API

下面我们一起来看一下API文档。

/**
 Current backgroundImage URL for the specified state.
 @return The image URL, or nil.
 */
- (nullable NSURL *)backgroundImageURLForState:(UIControlState)state;

/**
 Set the button's backgroundImage with a specified URL for the specified state.
 
 @param imageURL    The image url (remote or local file path).
 @param state       The state that uses the specified image.
 @param placeholder The image to be set initially, until the image request finishes.
 */
- (void)setBackgroundImageWithURL:(nullable NSURL *)imageURL
                            forState:(UIControlState)state
                         placeholder:(nullable UIImage *)placeholder;

/**
 Set the button's backgroundImage with a specified URL for the specified state.
 
 @param imageURL The image url (remote or local file path).
 @param state    The state that uses the specified image.
 @param options  The options to use when request the image.
 */
- (void)setBackgroundImageWithURL:(nullable NSURL *)imageURL
                            forState:(UIControlState)state
                             options:(YYWebImageOptions)options;

/**
 Set the button's backgroundImage with a specified URL for the specified state.
 
 @param imageURL    The image url (remote or local file path).
 @param state       The state that uses the specified image.
 @param placeholder The image to be set initially, until the image request finishes.
 @param options     The options to use when request the image.
 @param completion  The block invoked (on main thread) when image request completed.
 */
- (void)setBackgroundImageWithURL:(nullable NSURL *)imageURL
                            forState:(UIControlState)state
                         placeholder:(nullable UIImage *)placeholder
                             options:(YYWebImageOptions)options
                          completion:(nullable YYWebImageCompletionBlock)completion;

/**
 Set the button's backgroundImage with a specified URL for the specified state.
 
 @param imageURL    The image url (remote or local file path).
 @param state       The state that uses the specified image.
 @param placeholder The image to be set initially, until the image request finishes.
 @param options     The options to use when request the image.
 @param progress    The block invoked (on main thread) during image request.
 @param transform   The block invoked (on background thread) to do additional image process.
 @param completion  The block invoked (on main thread) when image request completed.
 */
- (void)setBackgroundImageWithURL:(nullable NSURL *)imageURL
                            forState:(UIControlState)state
                         placeholder:(nullable UIImage *)placeholder
                             options:(YYWebImageOptions)options
                            progress:(nullable YYWebImageProgressBlock)progress
                           transform:(nullable YYWebImageTransformBlock)transform
                          completion:(nullable YYWebImageCompletionBlock)completion;

/**
 Set the button's backgroundImage with a specified URL for the specified state.
 
 @param imageURL    The image url (remote or local file path).
 @param state       The state that uses the specified image.
 @param placeholder The image to be set initially, until the image request finishes.
 @param options     The options to use when request the image.
 @param manager     The manager to create image request operation.
 @param progress    The block invoked (on main thread) during image request.
 @param transform   The block invoked (on background thread) to do additional image process.
 @param completion  The block invoked (on main thread) when image request completed.
 */
- (void)setBackgroundImageWithURL:(nullable NSURL *)imageURL
                            forState:(UIControlState)state
                         placeholder:(nullable UIImage *)placeholder
                             options:(YYWebImageOptions)options
                             manager:(nullable YYWebImageManager *)manager
                            progress:(nullable YYWebImageProgressBlock)progress
                           transform:(nullable YYWebImageTransformBlock)transform
                          completion:(nullable YYWebImageCompletionBlock)completion;

/**
 Cancel the current backgroundImage request for a specified state.
 @param state The state that uses the specified image.
 */
- (void)cancelBackgroundImageRequestForState:(UIControlState)state;

这里只给出API接口，具体实现和上一篇的image部分是类似的，这里就不多说了。

后记

本篇主要讲述了background image部分，感兴趣的可以给个赞和关注，谢谢~~~