iOS在更改用户头像并保存至本地沙盒目录中对于UIImagePickerController、UIAlertController的使用方法
在ViewController.h中定义宏和方法
//
// ViewController.h
// Change avatar
//
// Created by ios on 2019/8/13.
// Copyright © 2019 纵昂. All rights reserved.
//
#import <UIKit/UIKit.h>
//获取系统版本号
#define IS_iOS8 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 ? YES : NO)
//获取屏幕尺寸
#define SW [UIScreen mainScreen].bounds.size.width
#define SH [UIScreen mainScreen].bounds.size.height
@interface ViewController : UIViewController
@property (nonatomic, strong)UIButton *iconBtn;
@end
第二步，在ViewController.m中实现方法
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
//初始化Button
_iconBtn = [[UIButton alloc]initWithFrame:CGRectMake((SW - 100)/2,(SH / 3) - 100,100,100)];
_iconBtn.backgroundColor =[UIColor redColor];
//加载首先访问本地沙盒是否存在相关图片
NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];
UIImage *savedImage = [UIImage imageWithContentsOfFile:fullPath];
if (!savedImage)
{
//默认头像
[_iconBtn setImage:[UIImage imageNamed:@"head"] forState:UIControlStateNormal];
}
else
{
[_iconBtn setImage:savedImage forState:UIControlStateNormal];
}
_iconBtn.layer.masksToBounds = YES;
_iconBtn.layer.cornerRadius = _iconBtn.frame.size.height / 2;
[_iconBtn addTarget:self action:@selector(changeIcon) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_iconBtn];
}
访问相机权限的相关方法
- (void)changeIcon
{
UIAlertController *alertController;
__block NSUInteger blockSourceType = 0;
// 判断是否支持相机
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
//支持访问相机与相册情况
alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alertController addAction:[UIAlertAction actionWithTitle:@"从相册中选取" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击从相册中选取");
//相册
blockSourceType = UIImagePickerControllerSourceTypePhotoLibrary;
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = blockSourceType;
[self presentViewController:imagePickerController animated:YES completion:nil];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击拍照");
//相机
blockSourceType = UIImagePickerControllerSourceTypeCamera;
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = blockSourceType;
[self presentViewController:imagePickerController animated:YES completion:nil];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击取消");
// 取消
return;
}]];
[self presentViewController:alertController animated:YES completion:nil];
}
else
{
//只支持访问相册情况
alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alertController addAction:[UIAlertAction actionWithTitle:@"从相册中选取" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击从相册中选取");
//相册
blockSourceType = UIImagePickerControllerSourceTypePhotoLibrary;
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.allowsEditing = YES;
imagePickerController.sourceType = blockSourceType;
[self presentViewController:imagePickerController animated:YES completion:^{
}];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"点击取消");
// 取消
return;
}]];
[self presentViewController:alertController animated:YES completion:nil];
}
}
选择图片后,回调选择
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissViewControllerAnimated:YES completion:nil];
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
/* 此处info 有六个可选类型
* UIImagePickerControllerMediaType; // an NSString UTTypeImage)
* UIImagePickerControllerOriginalImage; // a UIImage 原始图片
* UIImagePickerControllerEditedImage; // a UIImage 裁剪后图片
* UIImagePickerControllerCropRect; // an NSValue (CGRect)
* UIImagePickerControllerMediaURL; // an NSURL
* UIImagePickerControllerReferenceURL // an NSURL that references an asset in the AssetsLibrary framework
* UIImagePickerControllerMediaMetadata // an NSDictionary containing metadata from a captured photo
*/
[_iconBtn setImage:image forState:UIControlStateNormal];
[self saveImage:image withName:@"currentImage.png"];
}
最后一步，保存本地沙盒目录
#pragma mark - 保存图片至本地沙盒
- (void)saveImage:(UIImage *)currentImage withName:(NSString *)imageName
{
NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.8);
// 获取沙盒目录
NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];
// 将图片写入文件
[imageData writeToFile:fullPath atomically:NO];
}
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