IOS截屏，View截图的基本方法

IOS截屏的方法网上有很多，以下是我个人认为比较好的一个，我稍微改了一点

来源：SDScreenshotCapture

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

UIImage *getImageWithFullScreenshot(void)
{// Source (Under MIT License): https://github.com/shinydevelopment/SDScreenshotCapture/blob/master/SDScreenshotCapture/SDScreenshotCapture.m#L35BOOL ignoreOrientation = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0");UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;CGSize imageSize = CGSizeZero;if (UIInterfaceOrientationIsPortrait(orientation) || ignoreOrientation)imageSize = [UIScreen mainScreen].bounds.size;elseimageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);UIGraphicsBeginImageContextWithOptions(imageSize, NO, [UIScreen mainScreen].scale);CGContextRef context = UIGraphicsGetCurrentContext();for (UIWindow *window in [[UIApplication sharedApplication] windows]){CGContextSaveGState(context);CGContextTranslateCTM(context, window.center.x, window.center.y);CGContextConcatCTM(context, window.transform);CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);// Correct for the screen orientationif(!ignoreOrientation){if(orientation == UIInterfaceOrientationLandscapeLeft){CGContextRotateCTM(context, (CGFloat)M_PI_2);CGContextTranslateCTM(context, 0, -imageSize.width);}else if(orientation == UIInterfaceOrientationLandscapeRight){CGContextRotateCTM(context, (CGFloat)-M_PI_2);CGContextTranslateCTM(context, -imageSize.height, 0);}else if(orientation == UIInterfaceOrientationPortraitUpsideDown){CGContextRotateCTM(context, (CGFloat)M_PI);CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);}}if([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])[window drawViewHierarchyInRect:window.bounds afterScreenUpdates:NO];else[window.layer renderInContext:UIGraphicsGetCurrentContext()];CGContextRestoreGState(context);}UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

以上是全屏截图，下面修改部分区域截图，以下代码是UIWindow的Category

h文件

#import <UIKit/UIKit.h>@interface UIWindow (Category)- (UIImage *)screenshot;
- (UIImage *)screenshotWithRect:(CGRect)rect;@end

m文件

#import "UIWindow+Category.h"@implementation UIWindow (Category)- (UIImage *)screenshot
{return [self screenshotWithRect:self.bounds];
}- (UIImage *)screenshotWithRect:(CGRect)rect
{// Source (Under MIT License): https://github.com/shinydevelopment/SDScreenshotCapture/blob/master/SDScreenshotCapture/SDScreenshotCapture.m#L35BOOL ignoreOrientation = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0");UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;CGSize imageSize = CGSizeZero;CGFloat width = rect.size.width, height = rect.size.height;CGFloat x = rect.origin.x, y = rect.origin.y;//    imageSize = CGSizeMake(width, height);
//    UIGraphicsBeginImageContextWithOptions(imageSize, NO, [UIScreen mainScreen].scale);if (UIInterfaceOrientationIsPortrait(orientation) || ignoreOrientation){//imageSize = [UIScreen mainScreen].bounds.size;imageSize = CGSizeMake(width, height);x = rect.origin.x, y = rect.origin.y;}else{//imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);imageSize = CGSizeMake(height, width);x = rect.origin.y, y = rect.origin.x;}UIGraphicsBeginImageContextWithOptions(imageSize, NO, [UIScreen mainScreen].scale);CGContextRef context = UIGraphicsGetCurrentContext();CGContextSaveGState(context);CGContextTranslateCTM(context, self.center.x, self.center.y);CGContextConcatCTM(context, self.transform);CGContextTranslateCTM(context, -self.bounds.size.width * self.layer.anchorPoint.x, -self.bounds.size.height * self.layer.anchorPoint.y);// Correct for the screen orientationif(!ignoreOrientation){if(orientation == UIInterfaceOrientationLandscapeLeft){CGContextRotateCTM(context, (CGFloat)M_PI_2);CGContextTranslateCTM(context, 0, -self.bounds.size.height);CGContextTranslateCTM(context, -x, y);}else if(orientation == UIInterfaceOrientationLandscapeRight){CGContextRotateCTM(context, (CGFloat)-M_PI_2);CGContextTranslateCTM(context, -self.bounds.size.width, 0);CGContextTranslateCTM(context, x, -y);}else if(orientation == UIInterfaceOrientationPortraitUpsideDown){CGContextRotateCTM(context, (CGFloat)M_PI);CGContextTranslateCTM(context, -self.bounds.size.height, -self.bounds.size.width);CGContextTranslateCTM(context, x, y);}else{CGContextTranslateCTM(context, -x, -y);}}else{CGContextTranslateCTM(context, -x, -y);}//[self layoutIfNeeded];if([self respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];else[self.layer renderInContext:UIGraphicsGetCurrentContext()];CGContextRestoreGState(context);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}@end

此代码在旋转后，裁剪区域是相对左上角为原点旋转的，一般使用不到旋转情况

View截图

h文件

@interface UIView (Screenshot)
- (UIImage *)screenshot;
- (UIImage *)screenshotWithRect:(CGRect)rect;
@end

m文件

@implementation UIView (Screenshot)- (UIImage *)screenshot
{return [self screenshotWithRect:self.bounds];
}- (UIImage *)screenshotWithRect:(CGRect)rect;
{UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);CGContextRef context = UIGraphicsGetCurrentContext();if (context == NULL){return nil;}CGContextSaveGState(context);CGContextTranslateCTM(context, -rect.origin.x, -rect.origin.y);//[self layoutIfNeeded];if( [self respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]){[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];}else{[self.layer renderInContext:context];}CGContextRestoreGState(context);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();//    NSData *imageData = UIImageJPEGRepresentation(image, 1); // convert to jpeg
//    image = [UIImage imageWithData:imageData scale:[UIScreen mainScreen].scale];return image;
}

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