• 导入SKD
• 封装

前言：公司活动需要加入微信分享，有多处调用，就地封装了。
微信开放平台

1. 导入SDK

1.在微信开放平台添加新的应用获取到AppId,通过coopods集成。
2.需要在info中添加微信分享生产的AppId然后AppleDelegate 中注册微信

[WXApi registerApp:WXAPPID];

2. 封装

/**
 分享消息类型
 */
typedef NS_ENUM(NSInteger,BNNHomeWXShareToolMessageType) {
    /** 分享文本信息 */
    BNNHomeWXShareToolMessageTypeForTxt = 0,
    /** 分享截图 */
    BNNHomeWXShareToolMessageTypeForScreenShot = 1,
};

/** 分享目标 */
typedef NS_ENUM(NSInteger,BNNHomeWXShareToolToType) {
    /** 分享到朋友圈 */
    BNNHomeWXShareToolToTypeForTimeLine = 0,
    /** 分享到聊天界面 */
    BNNHomeWXShareToolToTypeForSession = 1,
    /** 分享到收藏 */
    BNNHomeWXShareToolToTypeForFavorite = 2,
};
#if 0
WXSceneSession  = 0,        /**< 聊天界面    */
WXSceneTimeline = 1,        /**< 朋友圈      */
WXSceneFavorite = 2,        /**< 收藏       */
#endif

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface BNNHomeWXShareTool : NSObject

+ (BNNHomeWXShareTool *)shareInstance;

/** 分享截图 */
- (void)shareWXWithShareTitle:(NSString *)ShareTitle Detail:(NSString *)shareDetail Image:(NSString *)shareImage Url:(NSString *)shareUrl MessageType:(NSInteger)shareMessageType shareView:(UIView *)shareView toType:(NSInteger)toType;

@end

#import "BNNHomeWXShareTool.h"

@interface BNNApiBNNTool ()

@end

@implementation BNNHomeWXShareTool


/**
 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317332&token=217ea698b9763c5cedc3e09ab3f8841bb31cae1b&lang=zh_CN

 @return 微信开发平台
 */
+ (BNNHomeWXShareTool *)shareInstance{
    static BNNHomeWXShareTool *bnnHomeWXShareTool;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        bnnHomeWXShareTool = [[BNNHomeWXShareTool alloc]init];
    });
    return bnnHomeWXShareTool;
}

- (void)shareWXWithShareTitle:(NSString *)ShareTitle Detail:(NSString *)shareDetail Image:(NSString *)shareImage Url:(NSString *)shareUrl MessageType:(NSInteger)shareMessageType shareView:(UIView *)shareView toType:(NSInteger)toType{
    
    /** 分享截图 */
    if (shareMessageType == BNNHomeWXShareToolMessageTypeForTxt) {
        /** 文本 */
        /** 网页 */
        
        if (toType == BNNHomeWXShareToolToTypeForTimeLine) {
            /** 分享到朋友圈 */
            
        }else if (toType == BNNHomeWXShareToolToTypeForSession){
            /** 分享到聊天界面 */
        }
        
        [self shareViewWithShareTitle:ShareTitle thumbImage:shareImage Detail:shareDetail Url:shareUrl toType:toType];
        
    }else if (shareMessageType == BNNHomeWXShareToolMessageTypeForScreenShot){
        /** 分享截图 */
//        [self shareViewWithImage:[self getImage]];
        /** 微信分享没有通过先保存截图 */
        
        [self getImage];
        
        /** 保存截图 */
        [self shareImageSaveWithshareView:shareView];
    }
}

#pragma mark - 保存照片到本地
- (void)shareImageSaveWithshareView:(UIView *)shareView{
    UIImage *newImage = [self rendImageWihthView:shareView];
    //    2.写入相册
    UIImageWriteToSavedPhotosAlbum(newImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}

#pragma mark - 屏幕截图 + 保存到相册
- (UIImage *)rendImageWihthView:(UIView *)view{
    //      1.开始位图上下文
    //    UIGraphicsBeginImageContext(view.frame.size);
    /** 高清截图 */
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);
    //      2.获取上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
    //    3.截图
    [view.layer renderInContext:ctx];
    //    4.获取图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    //    5.关闭上下文
    UIGraphicsEndImageContext() ;
    
    return newImage;
 
}
#pragma mark 用来监听图片保存到相册的状况

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        [SVProgressHUD showMessage:@"保存失败"];
    }else{
        [SVProgressHUD showMessage:@"截图保存成功，您可以分享了~"];
        
    }
    NSLog(@"%@",contextInfo);
    
}
#pragma mark 截取当前屏幕，并生成image对象
-(UIImage *)getImage
{
    /** 模糊截图 */
    //    UIGraphicsBeginImageContext([UIScreen mainScreen].bounds.size);
    /** 高清截图 */
    UIGraphicsBeginImageContextWithOptions([UIScreen mainScreen].bounds.size, NO, 0.0);
    [[UIApplication sharedApplication].windows[0].layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}
#pragma mark - 分享网页
- (void)shareViewWithShareTitle:(NSString *)shareTile thumbImage:(NSString *)shareImage Detail:(NSString *)shareDetail Url:(NSString *)shareUrl toType:(NSInteger)toType{
    
    WXWebpageObject *webpageObject = [WXWebpageObject object];
    webpageObject.webpageUrl = shareUrl;
    
    WXMediaMessage *message = [WXMediaMessage message];
    message.title = shareTile;
    message.description = shareDetail;
//    [message setThumbImage:[UIImage imageNamed:@"缩略图.jpg"]];
    [message setThumbImage:[self getImageFromURL:shareImage]];
    
    message.mediaObject = webpageObject;
    
    SendMessageToWXReq *req = [[SendMessageToWXReq alloc] init];
    req.bText = NO;
    req.message = message;
    
    if (toType == BNNHomeWXShareToolToTypeForTimeLine) {
        req.scene = WXSceneTimeline;
    }else if (toType == BNNHomeWXShareToolToTypeForSession){
        req.scene = WXSceneSession;
    }
    
    
//    req.scene = WXSceneSession;
    [WXApi sendReq:req];
    

}

#pragma mark - 网络图片转UIImage
- (UIImage *) getImageFromURL:(NSString *)fileURL

{
    UIImage * result;
    
    NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];
    
    result = [UIImage imageWithData:data];
    
    return result;
}

#pragma mark - 压缩图片
- (UIImage *)compressImage:(UIImage *)image toByte:(NSUInteger)maxLength {
    // Compress by quality
    CGFloat compression = 1;
    NSData *data = UIImageJPEGRepresentation(image, compression);
    if (data.length < maxLength) return image;
    
    CGFloat max = 1;
    CGFloat min = 0;
    for (int i = 0; i < 6; ++i) {
        compression = (max + min) / 2;
        data = UIImageJPEGRepresentation(image, compression);
        if (data.length < maxLength * 0.9) {
            min = compression;
        } else if (data.length > maxLength) {
            max = compression;
        } else {
            break;
        }
    }
    UIImage *resultImage = [UIImage imageWithData:data];
    if (data.length < maxLength) return resultImage;
    
    // Compress by size
    NSUInteger lastDataLength = 0;
    while (data.length > maxLength && data.length != lastDataLength) {
        lastDataLength = data.length;
        CGFloat ratio = (CGFloat)maxLength / data.length;
        CGSize size = CGSizeMake((NSUInteger)(resultImage.size.width * sqrtf(ratio)),
                                 (NSUInteger)(resultImage.size.height * sqrtf(ratio))); // Use NSUInteger to prevent white blank
        UIGraphicsBeginImageContext(size);
        [resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
        resultImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        data = UIImageJPEGRepresentation(resultImage, compression);
    }
    
    return resultImage;
}

调用：

  [[BNNHomeWXShareTool shareInstance] shareWXWithShareTitle:self.shareTitle Detail:self.shareDetail Image:self.shareImage Url:self.shareUrl MessageType:BNNHomeWXShareToolMessageTypeForTxt shareView:self.view toType:BNNHomeWXShareToolToTypeForTimeLine];