ios学习笔记——保存图片到相册
最近项目要用到，这是自己练手的程序
1 // 2 // ViewController.m 3 // SJZSaveImage 4 // 5 // Created by mac on 16/6/3. 6 // Copyright © 2016年 mac. All rights reserved. 7 // 8 9 #import "ViewController.h" 10 11 @interface ViewController () <UIActionSheetDelegate> 12 13 @property (nonatomic, strong) UIImage * image; 14 15 @end 16 17 @implementation ViewController 18 19 - (void)viewDidLoad { 20 [super viewDidLoad]; 21 self.title = @"保存图片"; 22 23 UIImage * image = [UIImage imageNamed:@"saveImage.jpg"]; 24 self.image = image; 25 26 UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height / 2)]; 27 imageView.center = self.view.center; 28 imageView.image = image; 29 30 [self.view addSubview:imageView]; 31 32 [self createButton]; 33 } 34 35 - (void)createButton 36 { 37 UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(40, self.view.frame.size.height * 7 / 8, self.view.frame.size.width - 80, 40)]; 38 button.backgroundColor = [UIColor whiteColor]; 39 [button setTitle:@"保存图片" forState:UIControlStateNormal]; 40 [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 41 button.layer.cornerRadius = 4.0; 42 [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside]; 43 [self.view addSubview:button]; 44 } 45 46 - (void)buttonClick 47 { 48 if([[UIDevice currentDevice].systemVersion doubleValue] > 8.0){ 49 //ios8之后用UIAlertController代替UIActionSheet 50 UIAlertController * alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet]; 51 52 //增加保存图片action 53 UIAlertAction *action = [UIAlertAction actionWithTitle:@"保存图片" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { 54 55 //将图片保存到相册，回调函数必须为这个形式 56 UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL); 57 58 }]; 59 60 [action setValue:[UIColor blackColor] forKey:@"_titleTextColor"]; 61 [alert addAction:action]; 62 63 //增加取消action 64 UIAlertAction * actionCancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { 65 66 }]; 67 [actionCancel setValue:[UIColor redColor] forKey:@"_titleTextColor"]; 68 [alert addAction:actionCancel]; 69 70 [self presentViewController:alert animated:YES completion:nil]; 71 }else{ 72 UIActionSheet * action = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"保存图片" otherButtonTitles:nil, nil]; 73 [action showInView:self.view]; 74 } 75 } 76 77 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 78 { 79 if(buttonIndex == 0){ 80 //将图片保存到相册,该函数的回调必须为这种形式 81 UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL); 82 } 83 } 84 85 //保存图片回调函数 86 - (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo 87 { 88 //我们可以在这里设置弹出框 89 if(error){ 90 NSLog(@"保存失败"); 91 }else{ 92 NSLog(@"保存成功"); 93 } 94 } 95 96 @end
