写个类继承NSObject
.h 文件
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface Util : NSObject
typedef void(^CapSuccessBlock)(UIImage *image,UIImage * thumbImage);
typedef void(^CapFailureBlock)(NSError *error);
+(instancetype)shareUtil;
/**
截屏
@param url 截屏的url
@param successBlock 截屏成功的回调
@param failureBlock 截屏失败的回调
*/
-(void)capturePicShareWitchUrl:(NSString*)url
success:(CapSuccessBlock) successBlock
failure:(CapFailureBlock) failureBlock;
@end
.m 文件
#import "Util.h"
#define kWindowWidth [UIScreen mainScreen].bounds.size.width
#define kWindowHeight [UIScreen mainScreen].bounds.size.height
#define KeyWindow [[UIApplication sharedApplication].delegate window]
@interface Util ()<UIWebViewDelegate>
{
CapSuccessBlock _successBlock;//截屏成功的回调
CapFailureBlock _failureBlock;//截屏失败的回调
}
@end
@implementation Util
static Util * util;
+(instancetype)shareUtil
{
if (!util)
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
util = [[Util alloc] init];
});
}
return util;
}
/** 截屏 */
-(void)capturePicShareWitchUrl:(NSString*)url
success:(CapSuccessBlock) successBlock
failure:(CapFailureBlock) failureBlock;
{
_successBlock = successBlock;
_failureBlock = failureBlock;
UIWebView * webView = [[UIWebView alloc] initWithFrame:KeyWindow.bounds];
webView.delegate = self;
webView.hidden = YES;
NSMutableURLRequest *re2 = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[webViewloadRequest:re2];
[KeyWindow addSubview:webView];
}
#pragma UIWebViewDelegate
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
UIImage * image = [self screenShotWithScrollView:webView.scrollView withSize:CGSizeZero];
UIImage * thumbImage = [self screenShotWithScrollView:webView.scrollView withSize:CGSizeMake(kWindowWidth, kWindowHeight)];
if (_successBlock)
{
_successBlock(image,thumbImage);
}
webView.delegate = nil;
[webViewremoveFromSuperview];
webView =nil;
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
if (_failureBlock)
{
_failureBlock(error);
}
}
//图片
- (UIImage *)screenShotWithScrollView:(UIScrollView *)scrollView withSize:(CGSize)size
{
UIImage* image;
UIGraphicsBeginImageContextWithOptions(size.width==0?scrollView.contentSize:size, NO, [UIScreen mainScreen].scale);
{
CGPoint savedContentOffset = scrollView.contentOffset;
CGRect savedFrame = scrollView.frame;
scrollView.contentOffset = CGPointZero;
scrollView.frame = size.width==0? CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height):CGRectMake(0, 0, size.width, size.height);
[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
image =UIGraphicsGetImageFromCurrentImageContext();
scrollView.contentOffset = savedContentOffset;
scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
if (image != nil)
{
return image;
}
return nil;
}
@end
调用
-(void)captureView:(UIBarButtonItem*)item
{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:window animated:YES];
hud.animationType =MBProgressHUDAnimationZoom;
hud.mode =MBProgressHUDModeText;
hud.detailsLabel.text = @"正在生成截图";
hud.detailsLabel.font = [UIFont systemFontOfSize:17.0];
[[Util shareUtil] capturePicShareWitchUrl:KCapUrl success:^(UIImage *image, UIImage *thumbImage) {
[MBProgressHUD hideHUDForView:[UIApplication sharedApplication].keyWindow animated:YES];
UIAlertController * alertVC = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"截图成功，是否保存到相册" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction * action1 = [UIAlertAction actionWithTitle:@"是" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)
{
[self saveImageToPhotos: image];
[self saveImageToPhotos: thumbImage];
[self showPromptWithText:@"保存到相册成功" hideAfterdelay:1.5];
}];
UIAlertAction * action2 = [UIAlertAction actionWithTitle:@"否" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alertVCaddAction:action1];
[alertVCaddAction:action2];
[self presentViewController:alertVC animated:YES completion:nil];
}failure:^(NSError *error) {
}];
}
- (MBProgressHUD *)showPromptWithText:(NSString *)text hideAfterdelay:(CGFloat)timeInterval
{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:window animated:YES];
hud.animationType =MBProgressHUDAnimationZoom;
hud.mode =MBProgressHUDModeText;
hud.detailsLabel.text = text;
hud.detailsLabel.font = [UIFont systemFontOfSize:17.0];
hud.removeFromSuperViewOnHide = YES;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timeInterval * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[hudhideAnimated:YES];
});
return hud;
}
#pragma mark - 保存截图到相册
- (void)saveImageToPhotos:(UIImage*)savedImage
{
dispatch_async(dispatch_get_main_queue(), ^{
UIImageWriteToSavedPhotosAlbum(savedImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
});
}
//回调方法
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo
{
NSString *msg = nil ;
if(error != NULL)
{
msg =@"保存图片失败" ;
}else
{
msg =@"保存图片成功" ;
}
NSLog(@"%@",msg);
}
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