`好吧,還是沒(méi)出原型圖,把頭像上傳的代碼整理一下,方便大家理解,這個(gè)是最常用最基本的功能了吧
iOS獲取圖片有三種方式:
- 直接調(diào)用攝像頭拍照
- 從相冊(cè)中選擇
- 從圖庫(kù)中選擇(其實(shí)圖庫(kù)里包含著相冊(cè),所以一般只用兩種)
系統(tǒng)提供了UIImagePickerController用來(lái)獲取圖片和視頻的接口
使用步驟如下
- 初始化UIImagePickerController
- 設(shè)置UIImagePickerController的數(shù)據(jù)源類(lèi)型
- 設(shè)置代理,遵循UIImagePickerControllerDelegate,UINavigationControllerDelegate協(xié)議
- 接收代理,存儲(chǔ)圖片
圖片來(lái)源為三種
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary, // 圖集
UIImagePickerControllerSourceTypeCamera, // 相機(jī)
UIImagePickerControllerSourceTypeSavedPhotosAlbum // 相冊(cè)
} __TVOS_PROHIBITED;
注意的是需要判定設(shè)備是否支持
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
NSLog(@"支持相機(jī)");
}
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
NSLog(@"支持圖庫(kù)");
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
NSLog(@"支持相片庫(kù)");
}
好了,寫(xiě)了個(gè)小Demo,直接上代碼了
#import "ViewController.h"
@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
/** imageView */
@property (nonatomic, strong) UIImageView *imageView;
/** imageViewR */
@property (nonatomic, strong) UIImageView *imageViewR;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.imageViewR = [[UIImageView alloc] initWithFrame:CGRectMake((self.view.frame.size.width - 100)/2, 30, 100, 100)];
self.imageViewR.backgroundColor = [UIColor grayColor];
self.imageViewR.layer.cornerRadius = 50;
self.imageViewR.layer.masksToBounds = YES; // 裁剪邊
[self.view addSubview:self.imageViewR];
self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(16, 140, self.view.frame.size.width - 32, self.view.frame.size.width - 32)];
self.imageView.backgroundColor = [UIColor grayColor];
[self.view addSubview:self.imageView];
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(16, CGRectGetMaxY(self.imageView.frame) + 20, self.view.frame.size.width - 32, 35);
btn.backgroundColor = [UIColor greenColor];
btn.layer.cornerRadius = 5;
btn.layer.masksToBounds = YES;
[btn setTitle:@"獲取圖片" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)btnClick:(UIButton *)button
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"選擇照片" message:nil preferredStyle:(UIAlertControllerStyleActionSheet)];
// 判斷是否支持相機(jī)
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIAlertAction *cameraAc = [UIAlertAction actionWithTitle:@"拍照" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
// 設(shè)置數(shù)據(jù)源類(lèi)型
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
[alertController addAction:cameraAc];
}
// 圖集
UIAlertAction *photoAc = [UIAlertAction actionWithTitle:@"相冊(cè)" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
[alertController addAction:photoAc];
// 相片庫(kù)
UIAlertAction *albumAc = [UIAlertAction actionWithTitle:@"相片庫(kù)" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;;
[self presentViewController:imagePickerController animated:YES completion:nil];
}];
[alertController addAction:albumAc];
UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alertController addAction:cancel];
[self presentViewController:alertController animated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:nil];
}
// 代理方法,獲取圖片
// 選取的信息都在info中捷凄，info 是一個(gè)字典。
/**
// info dictionary keys
UIKIT_EXTERN NSString *const UIImagePickerControllerMediaType __TVOS_PROHIBITED; // an NSString (UTI, i.e. kUTTypeImage)
UIKIT_EXTERN NSString *const UIImagePickerControllerOriginalImage __TVOS_PROHIBITED; // a UIImage
UIKIT_EXTERN NSString *const UIImagePickerControllerEditedImage __TVOS_PROHIBITED; // a UIImage
UIKIT_EXTERN NSString *const UIImagePickerControllerCropRect __TVOS_PROHIBITED; // an NSValue (CGRect)
UIKIT_EXTERN NSString *const UIImagePickerControllerMediaURL __TVOS_PROHIBITED; // an NSURL
UIKIT_EXTERN NSString *const UIImagePickerControllerReferenceURL NS_AVAILABLE_IOS(4_1) __TVOS_PROHIBITED; // an NSURL that references an asset in the AssetsLibrary framework
UIKIT_EXTERN NSString *const UIImagePickerControllerMediaMetadata NS_AVAILABLE_IOS(4_1) __TVOS_PROHIBITED; // an NSDictionary containing metadata from a captured photo
UIKIT_EXTERN NSString *const UIImagePickerControllerLivePhoto NS_AVAILABLE_IOS(9_1) __TVOS_PROHIBITED; // a PHLivePhoto
/
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
[picker dismissViewControllerAnimated:YES completion:nil];
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
// 保存圖片到本地沙盒,
[self saveImage:image withName:@"avatar.png"];
NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"avatar.png"];
UIImage *saveImage = [[UIImage alloc] initWithContentsOfFile:fullPath];
// 設(shè)置圖片顯示
self.imageView.image = saveImage;
self.imageViewR.image = saveImage;
}
- (void)saveImage:(UIImage *)currentImage withName:(NSString *)imageName
{
NSData *imageData = UIImageJPEGRepresentation(currentImage, 1); // 1為不縮放保存,取值為(0~1)
// 獲取沙河路徑
NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:imageName];
// 將照片寫(xiě)入文件
[imageData writeToFile:fullPath atomically:NO];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
