iOS Learning Note--uiimagepickercontroller Access albums

Last Update:2016-06-05 Source: Internet

Author: User

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If we just want to access the album, the work we do is very simple.1. Uiimagepickercontroller InitializationUiimagepickercontroller * Picker = [[uiimagepickercontroller alloc]init];2. Setting Properties1) SourceType attribute: The source of the data, there are three kinds of sources:enum { Uiimagepickercontrollersourcetypephotolibrary,//gallery Uiimagepickercontrollersourcetypecamera,//camera Uiimagepickercontrollersourcetypesavedphotosalbum//albums }; typedef Nsuinteger uiimagepickercontrollersourcetype;2) allowsediting property: whether to allow clipping3) Set proxy Deleage3. Display Uiimagepickercontroller[self PresentViewController:self.pickerController Animated:yes completion:nil];4. Implement Agent function-(void) imagepickercontroller: (uiimagepickercontroller *) Picker didfinishpickingmediawithinfo: (NSDictionary< NSString *,id> *) Info-(void) imagepickercontrollerdidcancel: (uiimagepickercontroller *) PickerIf we implement the Imagepickercontrollerdidcancel function, then we fail when we click the Cancel button, so we're going to call it in this Function.[picker Dismissviewcontrolleranimated:yes completion:nil];View album pictures, and change the picture simple implementation:<pre>1 #import "ViewController.h"2 #import "SJZViewController.h"3 4 @interfaceViewcontroller () <uiimagepickercontrollerdelegate, uinavigationcontrollerdelegate, UIActionSheetDelegate>5 6@property (nonatomic, Strong) UIImage *image;7@property (nonatomic, Strong) Uiimageview *imageView;8@property (nonatomic, Strong) Uiimagepickercontroller *pickercontroller;9 Ten @end one a @implementationViewcontroller - -- (void) Viewdidload { the [super viewdidload]; -Self.title =@"Select Picture"; - -UIImage * image = [UIImage imagenamed:@"saveimage.jpg"]; +Self.image =image; - +Uiimageview * ImageView = [[uiimageview alloc] initwithframe:cgrectmake (0,0, self.view.frame.size.width, self.view.frame.size.height/2)]; aImageview.center =self.view.center; atImageview.image =image; -Self.imageview =imageView; - [self.view addsubview:imageview]; - - [self createbutton]; - } in -- (void) Createbutton to { +UIButton * button = [[UIButton alloc] initwithframe:cgrectmake ( +, Self.view.frame.size.height *7/8, self.view.frame.size.width- the, +)]; -Button.backgroundcolor =[uicolor whitecolor]; the[button settitle:@"pick a picture from an album"forstate:uicontrolstatenormal]; * [button settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal]; $Button.layer.cornerRadius =4.0;Panax Notoginseng [button addtarget:self action: @selector (buttonclick) forcontrolevents:uicontroleventtouchupinside]; - [self.view addsubview:button]; the } + a //Create Uiimagepickercontroller object, lazy load the-(uiimagepickercontroller *) Pickercontroller + { - if(!_pickercontroller) { $ //Create a Uiimagepickercontroller object $Uiimagepickercontrollersourcetype sourcetype =uiimagepickercontrollersourcetypesavedphotosalbum; - -Uiimagepickercontroller * Picker =[[uiimagepickercontroller alloc]init]; thePicker.Delegate=self ; -Picker.allowsediting =YES;WuyiPicker.sourcetype =sourcetype; the -_pickercontroller =picker; wu } - about return_pickercontroller; $ } - -- (void) ButtonClick - { a if([[uidevice currentdevice].systemversion doublevalue] >=8.0){ +Uialertcontroller * Alert =[uialertcontroller Alertcontrollerwithtitle:nil Message:nil preferredstyle:uialertcontrollerstyleactionsheet ]; the - //Camera $Uialertaction * action = [uialertaction actionwithtitle:@"Camera"Style:uialertactionstyledefault handler:^ (uialertaction *_nonnull Action) { the //not implemented, implementation of the next phase the the }]; the[action Setvalue:[uicolor blackcolor] forkey:@"_titletextcolor"]; - [alert addaction:action]; in the //Access Albums theUialertaction * photoaction = [uialertaction actionwithtitle:@"Select from album"Style:uialertactionstyledefault handler:^ (uialertaction *_nonnull Action) { about the [self presentViewController:self.pickerController animated:yes completion:nil]; the }]; the[photoaction Setvalue:[uicolor blackcolor] forkey:@"_titletextcolor"]; + [alert addaction:photoaction]; - theUialertaction * cancleaction = [uialertaction actionwithtitle:@"Cancel"Style:uialertactionstylecancel handler:^ (uialertaction *_nonnull Action) {Bayi the }]; the[cancleaction Setvalue:[uicolor redcolor] forkey:@"_titletextcolor"]; - [alert addaction:cancleaction]; - the [self presentviewcontroller:alert animated:yes completion:nil]; the}Else{ theUiactionsheet * sheet = [[uiactionsheet alloc] initwithtitle:nilDelegate: Self cancelbuttontitle:@"Cancel"Destructivebuttontitle:nil otherbuttontitles:@"Camera",@"Select from album", nil]; the - [sheet showInView:self.view]; the } the } the 94- (void) Actionsheet: (uiactionsheet *) actionsheet clickedbuttonatindex: (nsinteger) buttonindex the { the if(buttonindex = =0){ the 98}Else if(buttonindex = =1){ about [self presentViewController:self.pickerController animated:yes completion:nil]; - }101 }102 103- (void) imagepickercontroller: (uiimagepickercontroller *) Picker didfinishpickingmediawithinfo: (NSDictionary<NSString *,ID> *) Info104 { theSelf.imageView.image =[info objectforkey:uiimagepickercontrolleroriginalimage];106 107 [picker Dismissviewcontrolleranimated:yes completion:nil];108 }109 the- (void) Imagepickercontrollerdidcancel: (uiimagepickercontroller *) Picker111 { the [picker Dismissviewcontrolleranimated:yes completion:nil];113 } the the @end</pre> Show Results:The part about the camera, the next article will be implemented ....iOS Learning Note--uiimagepickercontroller Access albums

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iOS Learning Note--uiimagepickercontroller Access albums

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