前言:本篇博文是本人阅读国外的IOS Programming Tutorial的一篇入门文章的学习过程总结,难度不大,因为是入门。主要是入门UIImagePickerController这个控制器,那么这个 控制器是干嘛的呢?就是调用设备摄像机功能用的。到后面可能需要您在真机上测试,因为iPhone模拟器无法支持摄像机功能,运行测试会崩溃的哦。
网址:http://www.appcoda.com/ios-programming-camera-iphone-app/
1、首先简单的创建一个工程,然后在storyboard和对应的.m文件中添加相关的代码,这个简明教程没有使用自动布局,不多说,看图识字:
2、下面是这个ViewController.m的完整实现:
#import "ViewController.h"
@interface ViewController () <UIImagePickerControllerDelegate,UINavigationControllerDelegate>
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 这段代码会自动判断当前设备是否有摄像机功能,如果没有,会弹窗提示
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Error"
message:@"Device has no camera"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[myAlertView show];
}
}
- (IBAction)takePhotot:(UIButton *)sender {
// 创建UIImagePickerController控制器对象
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:picker animated:YES completion:nil];
}
- (IBAction)selectPhoto:(UIButton *)sender {
// 创建UIImagePickerController控制器对象
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:nil];
}
#pragma mark - 代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
UIImage* chosenImage = info[UIImagePickerControllerEditedImage];
self.imageView.image = chosenImage;
[picker dismissViewControllerAnimated:YES completion:nil];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[picker dismissViewControllerAnimated:YES completion:nil];
}
@end