我已经通过单击 saveInfo 按钮将我的图像和文本保存到了 sqlite3 数据库中。
- (IBAction)saveInfo:(id)sender {
// Prepare the query string.
NSString *query;
if (self.recordIDToEdit == -1) {
query = [NSString stringWithFormat:@"insert into empInfo values('%@', '%@','%@','%@','%@','%@' )", self.txtEmpCode.text, self.txtName.text, self.txtDesignation.text,self.txtDepartment.text,self.txtTagline.text,self.saveImage.image];
}
else{
query = [NSString stringWithFormat:@"update empInfo set name='%@',empInfoCode='%@',designation='%@',department='%@',tagLine='%@',photo='%@' where empInfoCode=%d", self.txtEmpCode.text,self.txtName.text, self.txtDesignation.text,self.txtTagline.text,self.txtDepartment.text,self.saveImage.image, self.recordIDToEdit];
}
// Execute the query.--------------
[self.dbManager executeQuery:query];
// If the query is sucessfull the show this in the dubugger.
if (self.dbManager.affectedRows != 0) {
NSLog(@"Query was executed successfully. Affected rows = %d", self.dbManager.affectedRows);
// Here we inform the delegate that editing in app is finished.
[self.delegate editingInfoWasFinished];
// Pop the view controller.
[self.navigationController popViewControllerAnimated:YES];
}
else{
NSLog(@"%d",self.dbManager.affectedRows);
NSLog(@"---Could not execute the query.----");
}
}
然后,我使用这种方法加载数据,虽然能够访问文本数据,但是无法使用此方法加载图像。
-(void)loadInfoToEdit{
// Create the query.
NSString *query = [NSString stringWithFormat:@"select * from empInfo where empInfoCode=%d", self.recordIDToEdit];
// Load the relevant data.
NSArray *results = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
// Setting the loaded data to the textfields and imageView.
.
self.txtEmpCode.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"empInfoCode"]];
self.txtName.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"name"]];
self.txtDesignation.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"designation"]];
self.txtTagline.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"tagLine"]];
self.txtDepartment.text = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"department"]];
self.saveImage.image = [[results objectAtIndex:0] objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]];
// NSLog(@"This photo has:%@",[[results objectAtIndex:0]objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]]);
// self.saveImage.image= [[results objectAtIndex:0]objectAtIndex:[self.dbManager.arrColumnNames indexOfObject:@"photo"]];
// NSLog(@"This Nsdata object has %@",img);
// self.saveImage.image = [UIImage imageWithData:img];
}
如何将图像加载到 saveImage(UIImageView属性)中?
最佳答案
您应该将图像保存在文档目录中。为此,您应该先将图像转换为数据,然后再将数据保存(或写入)到documentdirectory
。并且您应该将图像名称保存到sqlite database
现在,当您从数据库中获取数据时,您将获得图像名称,通过该imagename
,您可以从document directory
中获取保存的图像数据,并且可以将该数据转换为图像,并且可以根据需要使用。
范例:
保存图片,
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *profilePicturePath = [docsDir stringByAppendingPathComponent:@"profilePicture"];
NSData *data = UIImageJPEGRepresentation(yourImage, 1.0);
[data writeToFile:profilePicturePath atomically:NO];
您可以检索类似的图像,
UIImage *img = [UIImage imageWithData:[NSData dataWithContentsOfFile:profilePicturePath]];