iOS uses the photo picker (uiimagepickercontrollerdelegate) to save to the data library, the image compression

iOS uses the photo picker (uiimagepickercontrollerdelegate) to save to the data library, the image compression
First look at the Uiimagepickercontrollerdelegate protocol, mainly using iOS-built graphics to select the controller
-(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker Didfinishpickingmediawithinfo: (nsdictionary *) info
Get a picture of the processing, example
-(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker Didfinishpickingmediawithinfo: (nsdictionary *) info { UIImage *image = [Info objectforkey:uiimagepickercontrolleroriginalimage];// UIImage *cmpimg = [appdelegate scaleimage:image toscale:kimagescalerate];//thumbnail NSData *blobimage = uiimagejpegrepresentation (cmpimg, kimagecompressrate);//Picture compressed to NSData [Self dismissmodalviewcontrolleranimated:yes]; [Self updateimage:blobimage withindexpath:indexpath_];//update picture (custom function) }
Call up the picture selector
-(void) SnapImage: (ID) sender { Uiimagepickercontroller *IPC = [[Uiimagepickercontroller alloc]init]; Ipc.sourcetype = uiimagepickercontrollersourcetypecamera;//Graphics source ipc.videoquality = Uiimagepickercontrollerqualitytypelow; Ipc.delegate = self; ipc.allowsediting = NO; [Self PRESENTMODALVIEWCONTROLLER:IPC animated:yes]; }
shrink function (definition)
-(UIImage *) Scaleimage: (UIImage *) image toscale: (float) scalesize { Uigraphicsbeginimagecontext (Cgsizemake (image.size.width*scalesize,image.size.height*scalesize)); [Image drawinrect:cgrectmake (0, 0, image.size.width * scalesize, Image.size.height *scalesize)]; UIImage *scaledimage = Uigraphicsgetimagefromcurrentimagecontext (); Uigraphicsendimagecontext (); return scaledimage; }
Save to Repository ※ Pictures are nsdata when they are uploaded
-(void) UpdateImage: (nsdata*) Image withindexpath: (nsindexpath*) Indexpath { NSDateFormatter *dateformat = [[NSDateFormatter alloc]init]; [DateFormat setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; nsdate* spentdate = [(spentmoney*) [dailycontent ObjectAtIndex:indexPath.row] spentdate]; NSString *date = [NSString Stringwithstring:[dateformat stringfromdate:spentdate]]; When the picture is introduced, it is already nsdata, so as long as you write it in simple BOOL sucess = [Fmdb executeupdate:@ "Update Spentmoney set contentimage =? Where spentdate=?", image, date]; if (!sucess) { [Appdelegate showmessagewith:@ "fail to insert Image" Andmessage:nil]; } DateFormat = nil; [Self fetchdata]; }
From the data library, examples are the contents of TableView's cell data, see the Red character part
-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) IndexPath { static NSString *cellidentifier = @ "Cell"; UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:cellidentifier]; if (Cell==nil) { cell = [[UITableViewCell alloc]initwithstyle:uitableviewcellstylesubtitle reuseidentifier:cellidentifier]; } Cell.accessorytype = Uitableviewcellaccessorydetaildisclosurebutton; Spentmoney *spentmoney = [Dailycontent objectAtIndex:indexPath.row]; NSDateFormatter *dateformat = [[NSDateFormatter alloc]init]; Dateformat.dateformat = @ "HH:mm:ss"; Cell.textLabel.text = [DateFormat stringFromDate:spentMoney.spentDate]; Cell.detailTextLabel.text = [NSString stringwithformat:@ "$%@", Spentmoney.money]; When a picture is stored in a library, it is nsdata, read it, and just use the imagewithdata to read the picture out. Cell.imageView.image = [UIImage imageWithData:spentMoney.contentImage]; return cell; DateFormat = nil; }