x、iOS保存图片至相册原生代码

#import <UIKit/UIKit.h>

@implementation Untility : NSObject 
static Untility *instance = nil;
+(Untility *)sharedInstance{
    @synchronized(self) {
        if(instance == nil) {
            instance = [[[self class] alloc] init];
        }
    }
    return instance;
}

- (void)loadImageFinished:(UIImage *)image
{
    UIImageWriteToSavedPhotosAlbum(image, self,
                                   @selector(image:didFinishSavingWithError:contextInfo:),
                                   (__bridge void *)self);
}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    //初始化提示框；
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"保存成功" preferredStyle:  UIAlertControllerStyleAlert];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"确定"
                                              style:UIAlertActionStyleDefault
                                            handler:^(UIAlertAction * _Nonnull action) {}]];
    
    //弹出提示框；
    [[self getCurrentVC] presentViewController:alert animated:true completion:nil];
}

- (UIViewController *)getCurrentVC
{
    UIViewController *result = nil;
    
    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal)
    {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for(UIWindow * tmpWin in windows)
        {
            if (tmpWin.windowLevel == UIWindowLevelNormal)
            {
                window = tmpWin;
                break;
            }
        }
    }
    
    UIView *frontView = [[window subviews] objectAtIndex:0];
    id nextResponder = [frontView nextResponder];
    
    if ([nextResponder isKindOfClass:[UIViewController class]])
        result = nextResponder;
    else
        result = window.rootViewController;
    
    return result;
}

@end

#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <err.h>
extern "C"{
    void SaveImageToSystemAlbum(const char* path){
        UIImage* image = [UIImage imageWithContentsOfFile:[NSString stringWithUTF8String:path]];
        [[Untility sharedInstance] loadImageFinished:image];
    }
}