ios学习笔记——UIImagePickerController访问相册

  1 #import "ViewController.h"
  2 #import "SJZViewController.h"
  3 
  4 @interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIActionSheetDelegate>
  5 
  6 @property (nonatomic, strong) UIImage * image;
  7 @property (nonatomic, strong) UIImageView * imageView;
  8 @property (nonatomic, strong) UIImagePickerController * pickerController;
  9 
 10 @end
 11 
 12 @implementation ViewController
 13 
 14 - (void)viewDidLoad {
 15     [super viewDidLoad];
 16     self.title = @"选取图片";
 17     
 18     UIImage * image = [UIImage imageNamed:@"saveImage.jpg"];
 19     self.image = image;
 20     
 21     UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height / 2)];
 22     imageView.center = self.view.center;
 23     imageView.image = image;
 24     self.imageView = imageView;
 25     [self.view addSubview:imageView];
 26     
 27     [self createButton];
 28 }
 29 
 30 - (void)createButton
 31 {
 32     UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(40, self.view.frame.size.height * 7 / 8, self.view.frame.size.width - 80, 40)];
 33     button.backgroundColor = [UIColor whiteColor];
 34     [button setTitle:@"从相册选取图片" forState:UIControlStateNormal];
 35     [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
 36     button.layer.cornerRadius = 4.0;
 37     [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
 38     [self.view addSubview:button];
 39 }
 40 
 41 //创建UIImagePickerController对象，懒加载
 42 - (UIImagePickerController *)pickerController
 43 {
 44     if(!_pickerController){
 45         //创建UIImagePickerController对象
 46         UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
 47         
 48         UIImagePickerController * picker = [[UIImagePickerController alloc]init];
 49         picker.delegate = self;
 50         picker.allowsEditing = YES;
 51         picker.sourceType = sourceType;
 52         
 53         _pickerController = picker;
 54     }
 55     
 56     return _pickerController;
 57 }
 58 
 59 - (void)buttonClick
 60 {
 61     if([[UIDevice currentDevice].systemVersion doubleValue] >= 8.0){
 62         UIAlertController * alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
 63         
 64         //相机
 65         UIAlertAction * action = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
 66             //未实现，下期实现
 67             
 68         }];
 69         [action setValue:[UIColor blackColor] forKey:@"_titleTextColor"];
 70         [alert addAction:action];
 71         
 72         //访问相册
 73         UIAlertAction * photoAction = [UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
 74             
 75             [self presentViewController:self.pickerController animated:YES completion:nil];
 76         }];
 77         [photoAction setValue:[UIColor blackColor] forKey:@"_titleTextColor"];
 78         [alert addAction:photoAction];
 79         
 80         UIAlertAction * cancleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
 81             
 82         }];
 83         [cancleAction setValue:[UIColor redColor] forKey:@"_titleTextColor"];
 84         [alert addAction:cancleAction];
 85         
 86         [self presentViewController:alert animated:YES completion:nil];
 87     }else{
 88         UIActionSheet * sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"相机", @"从相册选择", nil];
 89         
 90         [sheet showInView:self.view];
 91     }
 92 }
 93 
 94 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
 95 {
 96     if(buttonIndex == 0){
 97         
 98     }else if(buttonIndex == 1){
 99         [self presentViewController:self.pickerController animated:YES completion:nil];
100     }
101 }
102 
103 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
104 {
105     self.imageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];
106     
107     [picker dismissViewControllerAnimated:YES completion:nil];
108 }
109 
110 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
111 {
112     [picker dismissViewControllerAnimated:YES completion:nil];
113 }
114 
115 @end