这里介绍一种对相机拍照、相册选取照片功能的第三方封装库。在调用系统相机相册的基础上进一步优化；支持多选、预览、定位和展示图片资源大小等功能。以下简单贴出基本的使用方法，更多功能请自行研究该库的api和相应代理方法。
首先下载第三方库并导入工程：链接: https://pan.baidu.com/s/1bXcdMQ 密码: vkue
导入头文件：
#import "TZImagePickerController.h"
#import
#import
#import "TZImageManager.h"
#import "TZLocationManager.h"
声明代理和属性：
@property (nonatomic, strong) UIImagePickerController *imagePickerVc;
@property (strong, nonatomic) CLLocation *location;
- (UIImagePickerController *)imagePickerVc {
if (_imagePickerVc == nil) {
_imagePickerVc = [[UIImagePickerController alloc] init];
_imagePickerVc.delegate = self;
// set appearance / 改变相册选择页的导航栏外观
_imagePickerVc.navigationBar.barTintColor = self.navigationController.navigationBar.barTintColor;
_imagePickerVc.navigationBar.tintColor = self.navigationController.navigationBar.tintColor;
UIBarButtonItem *tzBarItem, *BarItem;
if (iOS9Later) {
tzBarItem = [UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[TZImagePickerController class]]];
BarItem = [UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UIImagePickerController class]]];
} else {
tzBarItem = [UIBarButtonItem appearanceWhenContainedIn:[TZImagePickerController class], nil];
BarItem = [UIBarButtonItem appearanceWhenContainedIn:[UIImagePickerController class], nil];
}
NSDictionary *titleTextAttributes = [tzBarItem titleTextAttributesForState:UIControlStateNormal];
[BarItem setTitleTextAttributes:titleTextAttributes forState:UIControlStateNormal];
}
return _imagePickerVc;
}
打开相机代码：
- (void)takePhoto {
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if ((authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied) && iOS7Later) {
// 无相机权限 做一个友好的提示
UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"无法使用相机" message:@"请在iPhone的""设置-隐私-相机""中允许访问相机" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"设置", nil];
[alert show];
} else if (authStatus == AVAuthorizationStatusNotDetermined) {
// fix issue 466, 防止用户首次拍照拒绝授权时相机页黑屏
if (iOS7Later) {
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
if (granted) {
dispatch_sync(dispatch_get_main_queue(), ^{
[self takePhoto];
});
}
}];
} else {
[self takePhoto];
}
// 拍照之前还需要检查相册权限
} else if ([TZImageManager authorizationStatus] == 2) { // 已被拒绝，没有相册权限，将无法保存拍的照片
UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"无法访问相册" message:@"请在iPhone的""设置-隐私-相册""中允许访问相册" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"设置", nil];
alert.tag = 1;
[alert show];
} else if ([TZImageManager authorizationStatus] == 0) { // 未请求过相册权限
[[TZImageManager manager] requestAuthorizationWithCompletion:^{
[self takePhoto];
}];
} else {
[self pushImagePickerController];
}
}
// 调用相机
- (void)pushImagePickerController {
// 提前定位
[[TZLocationManager manager] startLocationWithSuccessBlock:^(CLLocation *location, CLLocation *oldLocation) {
_location = location;
} failureBlock:^(NSError *error) {
_location = nil;
}];
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {
self.imagePickerVc.sourceType = sourceType;
if(iOS8Later) {
_imagePickerVc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
}
[self presentViewController:_imagePickerVc animated:YES completion:nil];
} else {
NSLog(@"模拟器中无法打开照相机,请在真机中使用");
}
}
打开相册代码：
-(void)pushTZImagePickerController{
TZImagePickerController *imagePickerVC = [[TZImagePickerController alloc]initWithMaxImagesCount:9 columnNumber:4 delegate:self pushPhotoPickerVc:YES];
[self presentViewController:imagePickerVC animated:YES completion:nil];
}
代理方法如下：
- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissViewControllerAnimated:YES completion:nil];
NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
if ([type isEqualToString:@"public.image"]) {
TZImagePickerController *tzImagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:1 delegate:self];
tzImagePickerVc.sortAscendingByModificationDate = YES;//对照品按照升序或者降序排序
[tzImagePickerVc showProgressHUD];
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
// save photo and get asset / 保存图片，获取到asset
[[TZImageManager manager] savePhotoWithImage:image location:self.location completion:^(NSError *error){
if (error) {
[tzImagePickerVc hideProgressHUD];
NSLog(@"图片保存失败 %@",error);
} else {
[[TZImageManager manager] getCameraRollAlbum:NO allowPickingImage:YES completion:^(TZAlbumModel *model) {
[[TZImageManager manager] getAssetsFromFetchResult:model.result allowPickingVideo:NO allowPickingImage:YES completion:^(NSArray *models) {
[tzImagePickerVc hideProgressHUD];
TZAssetModel *assetModel = [models firstObject];
if (tzImagePickerVc.sortAscendingByModificationDate) {
assetModel = [models lastObject];
}
//得到选中的图片
}];
}];
}
}];
}
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
if ([picker isKindOfClass:[UIImagePickerController class]]) {
[picker dismissViewControllerAnimated:YES completion:nil];
}
}
权限提醒：
#pragma mark - UIAlertViewDelegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 1) { // 去设置界面，开启相机访问权限
if (iOS8Later) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
} else {
NSURL *privacyUrl;
if (alertView.tag == 1) {
privacyUrl = [NSURL URLWithString:@"prefs:root=Privacy&path=PHOTOS"];
} else {
privacyUrl = [NSURL URLWithString:@"prefs:root=Privacy&path=CAMERA"];
}
if ([[UIApplication sharedApplication] canOpenURL:privacyUrl]) {
[[UIApplication sharedApplication] openURL:privacyUrl];
} else {
UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"抱歉" message:@"无法跳转到隐私设置页面，请手动前往设置页面，谢谢" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
[alert show];
}
}
}
}
实现的效果如下：
效果图.png
进一步阅读：【链接】iOS开发之获取照片&&TZImagePickerController
https://www.jianshu.com/p/abee982ac038