使用SDWebimage在UIButton中設置setBackgroundimage

Question

我想使用SDWebImage設置UIButton背景圖像。

代碼： -

[btn.imageView setImageWithURL:[NSURL URLWithString:@"image url here"]
                           placeholderImage:[UIImage imageNamed:@"placeholder"]];

謝謝

Answer 1

在SDWebImage中有這樣的方法： SDWebImage / SDWebImage / UIButton + WebCache.h

在您的班級中導入此文件：

#import <SDWebImage/UIButton+WebCache.h>

使用以下任何一種方法：

- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state;
- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state placeholderImage:(UIImage *)placeholder;
- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options;
- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state completed:(SDWebImageCompletionBlock)completedBlock;
- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state placeholderImage:(UIImage *)placeholder completed:(SDWebImageCompletionBlock)completedBlock;
- (void)sd_setBackgroundImageWithURL:(NSURL *)url forState:(UIControlState)state placeholderImage:(UIImage *)placeholder options:(SDWebImageOptions)options completed:(SDWebImageCompletionBlock)completedBlock;

Answer 2

您可以使用SDWebImage直接將圖像設置為UIButton

#import <SDWebImage/UIButton+WebCache.h>

 [btnProfilePic sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"IMAGE_URL_HERE"]]] forState:UIControlStateNormal];

或者使用塊

[btnProfilePic sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"IMAGE_URL_HERE"]]] forState:UIControlStateNormal placeholderImage:UIImage imageNamed:@"placeholderImage.png"] completed:
    ^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {

    }];

Answer 3

我完全同意@CRDave，但是如果你必須使用UIImageView方法來處理類似setImageWithPreviousCachedImageWithURL（寫作時不屬於UIButton類別），那么不要在完成塊中設置按鈕背景，否則你的占位符或漸進式加載不起作用。 而是設置如下：

    UIImageView *temp = [[UIImageView alloc] init];
    [temp sd_setImageWithPreviousCachedImageWithURL:[NSURL URLWithString:stringUrl] andPlaceholderImage:[UIImage imageNamed:@"loading.png"] options:SDWebImageRetryFailed progress:^(NSInteger receivedSize, NSInteger expectedSize) {
        //Nothing.
    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        //Nothing.
    }];
    [btnTheButton setBackgroundImage:temp.image forState:UIControlStateNormal];

Answer 4

UIImageView *imageViewb;
[imageViewb setImageWithURL:[NSURL URLWithString:@"image url here"]
                               placeholderImage:[UIImage imageNamed:@"placeholder"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
                [button setImage: imageViewb.image forState:UIControlStateNormal];       
            }];

Answer 5

如果#import <SDWebImage/UIButton+WebCache.h>那么我認為你必須使用#import“UIButton + WebCache.h”而不是#import <SDWebImage/UIButton+WebCache.h>

這對我來說很好

Answer 6

我在這里已經回答了這個問題，但為了方便起見，我將重新發布答案： https ： //stackoverflow.com/a/56616298/3904109

cell.bProfileImage.sd_setBackgroundImage(with: URL(string:
individualChatsListArray[indexPath.row].profile_image), for:
UIControl.State.normal, placeholderImage: UIImage(named:
"default_profile"), options: SDWebImageOptions(rawValue: 0)) { (image,
error, cache, url) in

}