我正在开发聊天,在聊天中我需要分享图片,我的应用有一个按钮可以从图库中选择图片。
这是我的按钮代码:
[upBtn2 addTarget:self action:@selector(uploadImage:) forControlEvents:UIControlEventTouchUpInside];
在图库中,用户可以选择一张图片与其他人聊天分享,对话只是一对一的聊天。
这是我的代码。
- (IBAction)uploadImage:(id)sender
{
if ([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
UIImagePickerController *imagePicker =
[[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType =
UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.mediaTypes = [NSArray arrayWithObjects:
(NSString *) kUTTypeImage,
nil];
imagePicker.allowsEditing = NO;
[self presentViewController:imagePicker animated:YES completion:nil];
newMedia = NO;
}
}
-(void)imagePickerControllerDidCancel:
(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:nil];
}
-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = [info
objectForKey:UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = [info
objectForKey:UIImagePickerControllerOriginalImage];
Uploadedimage.image=image;
if (newMedia)
UIImageWriteToSavedPhotosAlbum(image,
self,
@selector(image:finishedSavingWithError:contextInfo:),
nil);
}
else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
{
// Code here to support video if enabled
}
UIImage *image = [info
objectForKey:UIImagePickerControllerOriginalImage];
// [self performSelector:@selector(uploadToServer) withObject:nil afterDelay:0.0];
XMPPMessage *message = [[XMPPMessage alloc] initWithType:XMPP_MESSAGE_TYPE_CHAT to:[self.contact jid]];
NSData *imageData = UIImagePNGRepresentation(image);
NSString *imageStr = [GTMBase64 stringByEncodingData:imageData];
//decoding
NSData *imageData2 = [GTMBase64 decodeString:imageStr];
[message addBody:imageStr];
[[[AppDelegate appDelegate] xmppStream] sendElement:message];
XMPPJID *myJID = [[[AppDelegate appDelegate] xmppStream] myJID];
[self addMessage:@{
XMPP_TIMESTAMP: [NSDate date],
XMPP_MESSAGE_USERNAME: [myJID bare],
XMPP_MESSAGE_TEXT: imageStr,
}];
[self.tableView reloadData];
[self scrollToBottom:true];
}
- (void)image:(UIImage *)image
finishedSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo
{
if (error) {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle: @"Archivo guardado"
message: @"Error al guardar archivo"\
delegate: nil
cancelButtonTitle:@"Aceptar"
otherButtonTitles:nil];
[alert show];
}
}
我遇到了一个问题,它显示的代码
2014-10-14 11:01:21.973 Ucity[2907:60b] messages: ( { text = "/9j/4AAQSkZJRgABAQAAAQABAAD/4QBYRXhpZgAATU0AKgAAAAgAAgESAAMAAAABAAEAAIdpAAQAAAABAAAAJgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAE9KADAAQAAAABAAAFcAAAAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/..."
我需要在那里看到图像,但出于某种原因它显示了该文本。
我正在使用 GTMBase 64 库
#import "GTMBase64.h"
有人可以帮我解决这个问题吗?
最佳答案
那个神秘的文本就是图像。它只是图像的 base-64 字符串表示形式。我假设您执行此 base-64 编码是有原因的(例如,您要将图像上传到的某些服务需要此格式)。
从你的问题中我推测你想在某个地方显示图像。我只是试图将此与此代码协调,您在其中检索图像,将其转换为 base-64 字符串,然后丢弃原始图像,现在您问我们为什么只看到字符串。
如果您再次需要该图像,有几个选项:
保留您在
didFinishPickingMediaWithInfo
中获取的UIImage
(或NSData
)。您也可以将 base-64 字符串转换回
NSData
(然后从中创建UIImage
)。这是一个相当复杂的方法,但它会起作用。
顺便说一句,如果您愿意,您可以将 GTMBase64.h
替换为 Apple 在 iOS 7 中公开的 native base-64 方法。请参阅 https://stackoverflow.com/a/19794564/1271826。
此外,我个人不喜欢抓取 UIImage
并进行 PNG 转换来获取 NSData
。我总是将原始 Assets 作为 shown here 。这可以确保不会丢失信息,并且生成的 NSData
不会大于所需的大小。
关于ios - 在聊天中分享图片,base64 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26366755/