iOS截图和保存图片

最近整理一下以往的项目，分享一段截图和保存图片的代码，刚开始的时候写这东西的时候，有些凌乱，现在看来还是比较简单的，算是记录一下。直接上代码了，有注释，可以直接套用。

////  ViewController.m//  Test////  Created by york on 16/3/30.//  Copyright © 2016年 裴杨威. All rights reserved.//#define DEVICE_WIDTH [UIScreen mainScreen].bounds.size.width#define DEVICE_HEIGHT [UIScreen mainScreen].bounds.size.height#import "ViewController.h"@interface ViewController (){    UIImageView *topImageView;    UIImageView *bottomImageView;}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    self.view.backgroundColor = [UIColor grayColor];        topImageView = [[UIImageView alloc] initWithFrame:CGRectMake((DEVICE_WIDTH-252)/2, 20, 252, 220)];    topImageView.image = [UIImage imageNamed:@"1.jpg"];    [self.view addSubview:topImageView];        bottomImageView = [[UIImageView alloc] initWithFrame:CGRectMake((DEVICE_WIDTH-140)/2, CGRectGetMaxY(topImageView.frame), 140, 220)];    bottomImageView.image = [UIImage imageNamed:@"2.jpg"];    [self.view addSubview:bottomImageView];        UIButton *saveTopImageBtn = [UIButton buttonWithType:UIButtonTypeSystem];    saveTopImageBtn.frame = CGRectMake(10, CGRectGetMaxY(bottomImageView.frame)+20, (DEVICE_WIDTH-30)/2, 30);    [saveTopImageBtn setTitle:@"截图上图" forState:0];    saveTopImageBtn.tag = 100;    [saveTopImageBtn addTarget:self action:@selector(saveBtnClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:saveTopImageBtn];        UIButton *saveBottomImageBtn = [UIButton buttonWithType:UIButtonTypeSystem];    saveBottomImageBtn.frame = CGRectMake(CGRectGetMaxX(saveTopImageBtn.frame)+10, CGRectGetMaxY(bottomImageView.frame)+20, (DEVICE_WIDTH-30)/2, 30);    [saveBottomImageBtn setTitle:@"截图下图" forState:0];    saveBottomImageBtn.tag = 101;    [saveBottomImageBtn addTarget:self action:@selector(saveBtnClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:saveBottomImageBtn];        UIButton *saveAllImageBtn = [UIButton buttonWithType:UIButtonTypeSystem];    saveAllImageBtn.frame = CGRectMake(10, CGRectGetMaxY(saveTopImageBtn.frame)+20, (DEVICE_WIDTH-30)/2, 30);    [saveAllImageBtn setTitle:@"截图整屏" forState:0];    saveAllImageBtn.tag = 102;    [saveAllImageBtn addTarget:self action:@selector(saveBtnClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:saveAllImageBtn];        UIButton *SaveNetImageBtn = [UIButton buttonWithType:UIButtonTypeSystem];    SaveNetImageBtn.frame = CGRectMake(CGRectGetMaxX(saveTopImageBtn.frame)+10, CGRectGetMaxY(saveBottomImageBtn.frame)+20, (DEVICE_WIDTH-30)/2, 30);    [SaveNetImageBtn setTitle:@"保存网络图片" forState:0];    SaveNetImageBtn.tag = 103;    [SaveNetImageBtn addTarget:self action:@selector(saveBtnClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:SaveNetImageBtn];    }- (BOOL)isOpenAlbum//判断是否能打开相册{    if ([UIImagePickerController isSourceTypeAvailable:         UIImagePickerControllerSourceTypePhotoLibrary])    {        return YES;    }    else    {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"无法打开相册" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];        return NO;    }}#pragma mark -#pragma mark --保存通过url获取的图片--- (void)saveNetImage{    NSData *dateImg = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://d.hiphotos.baidu.com/image/h%3D200/sign=8663264274f082023292963f7bfbfb8a/f3d3572c11dfa9eca13b947665d0f703918fc1be.jpg"]];    UIImage *image = [UIImage imageWithData:dateImg];    UIImageWriteToSavedPhotosAlbum(image, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);}#pragma mark -#pragma mark --截图--- (UIImage *)getRealImage:(UIView *)view{    /*    UIGraphicsBeginImageContextWithOptions(<#CGSize size#>, <#BOOL opaque#>, <#CGFloat scale#>)     size ----> 新创建的位图上下文的大小     opaque ----> 透明度开关     scale ----> 缩放因子 0指的是系统会自动设置正确的比例     */    UIGraphicsBeginImageContextWithOptions(view.bounds.size,YES,0);//创建一个基于位图的上下文    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}#pragma mark -#pragma mark --系统保存图片的方法--- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{    if (!error) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"保存成功" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];    }else    {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"保存失败" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];    }}#pragma mark -#pragma mark --按钮点击事件--- (void)saveBtnClick:(UIButton *)sender{    switch (sender.tag) {        case 100:        {            if ([self isOpenAlbum]) {                UIImageWriteToSavedPhotosAlbum([self getRealImage:topImageView], self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);            }        }            break;        case 101:        {            if ([self isOpenAlbum]) {                UIImageWriteToSavedPhotosAlbum([self getRealImage:bottomImageView], self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);            }        }            break;        case 102:        {            if ([self isOpenAlbum]) {                UIImageWriteToSavedPhotosAlbum([self getRealImage:self.view], self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);            }        }            break;        case 103:        {            if ([self isOpenAlbum]) {                [self saveNetImage];            }        }            break;        default:            break;    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end