iOS下载预览

#import <Foundation/Foundation.h>


typedef NS_ENUM(NSInteger, QHFileType) {
    QHFileTypePlan, //企业计划书
    QHFileTypeMoney,//企业财务
    QHFileTypeAsset//企业资产
};

@interface QHDownLoadManager : NSObject


- (void)downloadwithURLstr:(NSString *)urlStr projectId:(NSString *)projectId andType:(QHFileType)fileType   progressHandler:(void(^)(float percent))progressHandler complete:(void(^)(BOOL isSuccess,NSString *locaPath))complete;


@end

#import <AFNetworking/AFNetworking.h>



@implementation QHDownLoadManager

- (void)downloadwithURLstr:(NSString *)urlStr projectId:(NSString *)projectId andType:(QHFileType)fileType   progressHandler:(void(^)(float percent))progressHandler complete:(void(^)(BOOL isSuccess,NSString *locaPath))complete{
    
    NSString *fileName;
    
    switch (fileType) {
        case QHFileTypePlan:
        {
            fileName = [NSString stringWithFormat:@"%@Plan",projectId];
        }
            break;
        case QHFileTypeMoney:
        {
            fileName = [NSString stringWithFormat:@"%@Money",projectId];
            
        }
            break;
        case QHFileTypeAsset:
        {
            
            fileName = [NSString stringWithFormat:@"%@Asset",projectId];
        }
            break;
        default:
            break;
    }
    
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@", KURLQINIUGetImageTwo, urlStr]];
    fileName = [NSString stringWithFormat:@"%@%@",fileName,[url lastPathComponent]];
    NSString *filePath = [self documentsPath:fileName];
    if ([fileManager fileExistsAtPath:filePath]) {
        if (complete) {
            complete(YES,filePath);
        }
    }else{
        
        
       // NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@",KURLQINIUGetImageTwo,urlStr]];
        
  
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
           
            if (progressHandler) {
                progressHandler( downloadProgress.completedUnitCount);
            }
            
            
        } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
           
            return [NSURL fileURLWithPath:filePath];
            
            
        } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
            if (complete) {
                complete(error?NO:YES,[filePath path]);
            }
            
        }];
        
        [task resume];
        
 
    }
    
}



- (NSString *)documentsPath:(NSString *)fileName{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths lastObject];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
    
    return filePath;
    
}


@end

使用：

#pragma mark 文件预览下载
- (void)previewFileClicked:(NSString *)title {
    NSString *fileURL;
    QHFileType type = QHFileTypePlan;
    if ([title isEqualToString:QHLocalizedString(@"商业计划书", nil)]) {
        fileURL = _icoModel.businessPlan;
        type = QHFileTypePlan;
    }else if ([title isEqualToString:QHLocalizedString(@"企业财务报表", nil)]) {
        fileURL = _icoModel.financial;
        type = QHFileTypeMoney;
    }else if ([title isEqualToString:QHLocalizedString(@"企业资产评估报告", nil)]) {
        fileURL = _icoModel.appraisalReport;
        type = QHFileTypeAsset;
    }
    
    [[[QHDownLoadManager alloc]init] downloadwithURLstr:fileURL projectId:_icoModel.recordId andType:type progressHandler:^(float percent) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self showProgress:percent];
        });
    } complete:^(BOOL isSuccess, NSString *locaPath) {
        if (isSuccess) {
            [MBProgressHUD hideHUDForView:self.view animated:YES];
            [self openDocxWithPath:locaPath];
        }else{
            [MBProgressHUD showMessag:QHLocalizedString(@"上传失败", nil) toView:self.view afterDelay:hiddenMBPTime];
            
        }
        
        
    }];
}

- (void)showProgress:(CGFloat)progress{
    MBProgressHUD *hud = [MBProgressHUD HUDForView:self.view];
    if(!hud){
        hud = [[MBProgressHUD alloc]initWithView:self.view];
        hud.mode = MBProgressHUDModeAnnularDeterminate;
        hud.removeFromSuperViewOnHide = YES;
        [self.view addSubview:hud];
        [hud show:YES];
    }
    
    hud.progress = progress;
}

-(void)openDocxWithPath:(NSString *)filePath{
    
    //    QHDocViewCtrl *doc = [[QHDocViewCtrl alloc]initWithNibName:@"QHDocViewCtrl" bundle:nil];
    //    doc.docPath = filePath;
    //    [self.navigationController pushViewController:doc animated:YES];
    
    NSURL *urlPath = [NSURL fileURLWithPath:filePath];
    
    UIDocumentInteractionController *doc= [UIDocumentInteractionController interactionControllerWithURL:urlPath];
    doc.delegate = self;
    doc.name = QHLocalizedString(@"文件", nil);
    [doc presentPreviewAnimated:YES];
}

- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller{
    
    return self;
}

- (UIView*)documentInteractionControllerViewForPreview:(UIDocumentInteractionController*)controller {
    
    return self.view;
}

- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController*)controller {
    
    
    return self.view.frame;
}