一、背景需求介绍
怎么让APP支持查看&打印word,pdf文档?
iOS是有支持这个功能的控件QLPreviewController.
配置:
只需导入库:
二、示例代码如下:
实现的功能是在一个webView中点击获取下载地址进行下载一个文件,之后用QLPreviewController打开,QLPreviewController支持打印功能.
在.h文件中
#import#import@interface ViewController : UIViewController
//打开word文档需要引入的视图控制器
@property(nonatomic,strong) QLPreviewController *previewController;
@end
在.m文件中
#import "ViewController.h"
#import "AFNetworking.h"
@interface ViewController ()
//保存本地的地址
@property (nonatomic ,copy) NSString *path;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self initWeb];
}
- (void)initWeb
{
UIWebView *web =[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
NSString *url = @"网页地址";
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
web.delegate = self;
[web loadRequest:request];
[self.view addSubview:web];
}
#pragma UIWebViewDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
//判断是否是单击
if (navigationType == UIWebViewNavigationTypeLinkClicked)
{
//点击网页中的文件截取到的网址(文件下载地址)
NSURL *url = [request URL];
if([[UIApplication sharedApplication]canOpenURL:url])
{
NSLog(@"url==%@",url);
//缓存到本地沙盒的地址
NSString *savedPath = [NSHomeDirectory() stringByAppendingString:@"/Documents/附件详情"];
[self downloadFileWithOption:nil withInferface:[url absoluteString] savedPath:savedPath downloadSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
} downloadFailure:^(AFHTTPRequestOperation *operation, NSError *error) {
} progress:^(float progress) {
}];
}
return NO;
}
return YES;
}
//下载文档,并保存(这里比较low还用的AFNetworking 2.x 来下载附件)
- (void)downloadFileWithOption:(NSDictionary *)paramDic withInferface:(NSString*)requestURL savedPath:(NSString*)savedPath downloadSuccess:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success downloadFailure:(void (^)(AFHTTPRequestOperation *operation,NSError *error))failure progress:(void (^)(float progress))progress
{
AFHTTPRequestSerializer *serializer = [AFHTTPRequestSerializer serializer];
NSMutableURLRequest *request =[serializer requestWithMethod:@"GET" URLString:requestURL parameters:paramDic error:nil];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
[operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:savedPath append:NO]];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
float p = (float)totalBytesRead / totalBytesExpectedToRead;
progress(p);
// NSLog(@"download：%f", (float)totalBytesRead / totalBytesExpectedToRead);
}];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
success(operation,responseObject);
_path = nil;
NSDictionary *dic = operation.response.allHeaderFields;
NSLog(@"下载成功,%@",dic);
NSString *fileName = dic[@"Content-Disposition"];
if(fileName){
//判断格式
if ([fileName rangeOfString:@".docx"].location !=NSNotFound) {
// NSLog(@"docx文档");
NSFileManager *manager = [NSFileManager new];
_path = [savedPath stringByAppendingString:@".docx"];
[manager moveItemAtPath:savedPath toPath:_path error:nil];
}else if ([fileName rangeOfString:@".doc"].location !=NSNotFound){
// NSLog(@"doc文档");
NSFileManager *manager = [NSFileManager new];
_path = [savedPath stringByAppendingString:@".doc"];
[manager moveItemAtPath:savedPath toPath:_path error:nil];
}else if([fileName rangeOfString:@".png"].location !=NSNotFound){
// NSLog(@"图片");
_path = [savedPath stringByAppendingString:@".png"];
NSFileManager *manager = [NSFileManager new];
_path = [savedPath stringByAppendingString:@".png"];
[manager moveItemAtPath:savedPath toPath:_path error:nil];
}else if([fileName rangeOfString:@".jpg"].location !=NSNotFound){
// NSLog(@"图片");
_path = [savedPath stringByAppendingString:@".jpg"];
NSFileManager *manager = [NSFileManager new];
_path = [savedPath stringByAppendingString:@".jpg"];
[manager moveItemAtPath:savedPath toPath:_path error:nil];
}
}
if (_path) {
self.previewController = [QLPreviewController new];
self.previewController.dataSource = self;
[self.previewController setDelegate:self];
//跳转到打开word文档页面
[self presentViewController:self.previewController animated:YES completion:nil];
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
success(operation,error);
NSLog(@"下载失败,error==%@",error);
}];
[operation start];
}
#pragma QLPreViewDelegate
- (NSInteger) numberOfPreviewItemsInPreviewController: (QLPreviewController *) controller{ return 1;}- (id)previewController: (QLPreviewController *)controller previewItemAtIndex:(NSInteger)index
{
return [NSURL fileURLWithPath:_path];
}
- (void)previewControllerDidDismiss:(QLPreviewController *)controller
{
if(![_path isEqual: @""]){
NSFileManager * fileManager = [[NSFileManager alloc]init];
[fileManager removeItemAtPath:_path error:nil];
}
}
@end
之后的打开的页面如图:
点击print后,连接支持airPrint的打印机进行打印:
