去厦门旅游要多少钱,动什么别动感情txt,027旅游新闻网
前言：相信大家都知道大部分的app都是有我的模块的，而在我的模块基本都有用户的头像等信息，并且是可以更改头像的。那么今天小编给大家简单介绍一下ios开发中如何调用系统相机拍照或者相册获取照片。要获取系统相机或者相册，我们需要使用到 uiimagepickercontroller 这个类。下面我们来看一下如何实现：
首先，需要遵循 uiimagepickercontroller 代理的两个协议： <uiimagepickercontrollerdelegate, uinavigationcontrollerdelegate>。为什么是两个协议呢？你按着 command 键，点击 uiimagepickercontroller 的 delegate 就会发现其实这个代理遵循了两个协议。
我要评论
#import "headerphotoviewcontroller.h"
@interface headerphotoviewcontroller () <uiimagepickercontrollerdelegate, uinavigationcontrollerdelegate>
@property (nonatomic, strong) uiimageview * imageview;
@end
@implementation headerphotoviewcontroller
- (void)viewdidload {
[super viewdidload];
self.navigationitem.title = @"设置头像";
self.view.backgroundcolor = [uicolor whitecolor];
[self setnavigation];
[self addsubviews];
[self makeconstraintsforui];
}
#pragma mark - set navigation
- (void)setnavigation {
self.navigationitem.rightbarbuttonitem = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemcamera target:self action:@selector(selectphoto:)];
}
#pragma mark - navitation item action
- (void)selectphoto:(uibarbuttonitem *)itemcamera {
//创建uiimagepickercontroller对象，并设置代理和可编辑
uiimagepickercontroller * imagepicker = [[uiimagepickercontroller alloc] init];
imagepicker.editing = yes;
imagepicker.delegate = self;
imagepicker.allowsediting = yes;
//创建sheet提示框，提示选择相机还是相册
uialertcontroller * alert = [uialertcontroller alertcontrollerwithtitle:@"请选择打开方式" message:nil preferredstyle:uialertcontrollerstyleactionsheet];
//相机选项
uialertaction * camera = [uialertaction actionwithtitle:@"相机" style:uialertactionstyledefault handler:^(uialertaction * _nonnull action) {
//选择相机时，设置uiimagepickercontroller对象相关属性
imagepicker.sourcetype = uiimagepickercontrollersourcetypecamera;
imagepicker.modalpresentationstyle = uimodalpresentationfullscreen;
imagepicker.mediatypes = @[(nsstring *)kuttypeimage];
imagepicker.cameracapturemode = uiimagepickercontrollercameracapturemodephoto;
//跳转到uiimagepickercontroller控制器弹出相机
[self presentviewcontroller:imagepicker animated:yes completion:nil];
}];
//相册选项
uialertaction * photo = [uialertaction actionwithtitle:@"相册" style:uialertactionstyledefault handler:^(uialertaction * _nonnull action) {
//选择相册时，设置uiimagepickercontroller对象相关属性
imagepicker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
//跳转到uiimagepickercontroller控制器弹出相册
[self presentviewcontroller:imagepicker animated:yes completion:nil];
}];
//取消按钮
uialertaction * cancel = [uialertaction actionwithtitle:@"取消" style:uialertactionstylecancel handler:^(uialertaction * _nonnull action) {
[self dismissviewcontrolleranimated:yes completion:nil];
}];
//添加各个按钮事件
[alert addaction:camera];
[alert addaction:photo];
[alert addaction:cancel];
//弹出sheet提示框
[self presentviewcontroller:alert animated:yes completion:nil];
}
#pragma mark - add subviews
- (void)addsubviews {
[self.view addsubview:self.imageview];
}
#pragma mark - make constraints
- (void)makeconstraintsforui {
__weak typeof(self)weakself = self;
[_imageview mas_makeconstraints:^(masconstraintmaker *make) {
make.size.mas_equalto(cgsizemake(screen_width, screen_width));
make.centerx.mas_equalto(weakself.view.mas_centerx);
make.centery.mas_equalto(weakself.view.mas_centery);
}];
}
#pragma mark - imagepickercontroller delegate
- (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary<nsstring *,id> *)info {
[picker dismissviewcontrolleranimated:yes completion:nil];
//获取到的图片
uiimage * image = [info valueforkey:uiimagepickercontrollereditedimage];
_imageview.image = image;
}
#pragma mark - setter and getter
- (uiimageview *)imageview {
if (!_imageview) {
_imageview = [[uiimageview alloc] init];
_imageview.backgroundcolor = [uicolor greencolor];
_imageview.contentmode = uiviewcontentmodescaleaspectfill;
}
return _imageview;
}
@end
ok！demo的所有代码都已经给大家呈现出来了，最后一步就是配置plist文件，千万不要忘了这个，要不会崩的。plist文件里边添加调用相机的字段privacy - camera usage description 和调用相册的字段：privacy - photo library usage description。万事俱备，就差一个测试的苹果手机了，相机的测试需要使用真机测试。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
如对本文有疑问，请在下面进行留言讨论，广大热心网友会与你互动！！ 点击进行留言回复
iOS 使用UITextField自定义搜索框 实现用户输入完之后“实时搜索”功能
网友评论