iOS开发学习之保存照片到系统相册

最新推荐文章于 2021-01-16 20:05:44 发布

原创最新推荐文章于 2021-01-16 20:05:44 发布 · 532 阅读

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#导航 #ios 开发 #代码 #uiimageview #uiimage

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本文介绍如何在iOS应用中创建UIImageView来显示图片，并通过UIButton触发保存图片到系统相册的功能。文章详细展示了如何设置UIImageView和UIButton的属性，以及实现保存图片的具体代码。

创建UIImageView

创建UIImageView是为了将照片展示出来，我们是要把UIImage保存到系统相册(Photo Alum):

#import "ViewController.h"
#define SCREEN [UIScreen mainScreen].bounds.size

@interface ViewController ()
@property (nonatomic,strong) UIImage *image;

@end

@implementation ViewController
            
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.image = [UIImage imageNamed:@"apple.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN.width - 300)/2, 70, 300, 150)];
    imageView.image = self.image;
    [self.view addSubview:imageView];
}

@end

创建UIButton

创建UIButton并绑定actionClick:事件

#import "ViewController.h"
#define SCREEN [UIScreen mainScreen].bounds.size

@interface ViewController ()

@end

@implementation ViewController
            
- (void)viewDidLoad
{
    [super viewDidLoad];
    UIButton *button = [[UIButton alloc] init];
    button.frame = CGRectMake(100, 300, SCREEN.width - 200, 40);
    [button addTarget:self action:@selector(actionClick:) forControlEvents:UIControlEventTouchUpInside];
    [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor orangeColor]];
    [button setTitle:@"learn savePhoto" forState:UIControlStateNormal];
    [self.view addSubview:button];
}

-(void)actionClick:(UIButton *)button
{
    NSLog(@"click");
}
@end

保存照片到系统相册(Photo Alum)

在actionClick:方法里调用：

UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);

这个时候，我们想知道是否成功，所有需要制定毁掉的方法

//指定毁掉方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    if (!error) {
        NSLog(@"save success");
    } else {
        NSLog(@"save failed");
    }
}