沧州公司做网站,官方网站手机,网络科技公司起名大全免费,app公司的组织结构文章目录 1.将整个view截图返回image#xff1a;2.截取view的部分区域#xff0c;返回image#xff1a;3.旧方法#xff1a;4.Tips参考#xff1a; 1.将整个view截图返回image#xff1a;
这些 api 已被废弃#xff0c;所以需要判断 iOS 版本 写两套代码#xff1a; R… 文章目录 1.将整个view截图返回image2.截取view的部分区域返回image3.旧方法4.Tips参考 1.将整个view截图返回image
这些 api 已被废弃所以需要判断 iOS 版本 写两套代码 Replace usage of UIGraphicsBeginImageContextWithOptions with UIGraphicsImageRenderer. Replace usage of UIGraphicsGetImageFromCurrentImageContext with UIGraphicsImageRendererContext.currentImage.
Swift 版本
/// 截图整个view
/// - Returns: image
func mooSnapshot() - UIImage? {if self.window nil {return nil}let scale UIScreen.main.scalevar image: UIImage? nil// 1. 创建绘图渲染格式if #available(iOS 10.0, *) {let format UIGraphicsImageRendererFormat()format.scale scaleformat.opaque self.isOpaque// 2. 创建绘图渲染器let renderer UIGraphicsImageRenderer(size: self.bounds.size,format: format)// 3. 绘制图image renderer.image { context inlet success self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print(draw success: \(success))}} else {UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.isOpaque, scale);let success self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print(draw success: \(success))image UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return image
}OC版本
- (UIImage * _Nullable)mooSnapshot {if (CGRectGetWidth(self.bounds) 0.0 || CGRectGetHeight(self.bounds) 0.0) {return nil;}if (!self.window) {return nil;}if (!self.superview) {return nil;}CGFloat scale [UIScreen mainScreen].scale;UIImage *image nil;if (available(iOS 10.0, *)) {UIGraphicsImageRendererFormat *format [[UIGraphicsImageRendererFormat alloc] init];format.scale scale;format.opaque NO;UIGraphicsImageRenderer *renderer [[UIGraphicsImageRenderer alloc] initWithSize:self.bounds.sizeformat:format];image [renderer imageWithActions:^(UIGraphicsImageRendererContext * _Nonnull rendererContext) {BOOL success [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];NSLog(%p, Snapshot success: %, self, (success));}];} else {UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, scale);BOOL success [self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];NSLog(%p, Snapshot success: %, self, (success));image UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return image;
}2.截取view的部分区域返回image
Capture the frame area of the view.
Swift 版本
import CoreGraphics
extension UIView {/// 截取view的部分区域/// - Parameter frame: 需要截取的区域/// - Returns: imagefunc mooSnapshotForFrame(_ frame: CGRect) - UIImage? {guard let image self.mooSnapshot() else { return nil }guard let cgImage image.cgImage else { return nil }let scale UIScreen.main.scale// 根据屏幕倍率将 frame 进行缩放let scaledRect CGRectApplyAffineTransform(frame, CGAffineTransformMakeScale(scale, scale))// 根据 缩放frame 进行裁剪guard let scaledCGImage cgImage.cropping(to: scaledRect) else { return nil }let returnImage UIImage(cgImage: scaledCGImage)return returnImage}
}OC 版本
- (UIImage * _Nullable)mooSnapshotForFrame:(CGRect)frame {if (CGRectGetWidth(frame) 0.0 || CGRectGetHeight(frame) 0.0) {return nil;}UIImage *image [self mooSnapshot];if (!image) {return nil;}CGFloat scale [UIScreen mainScreen].scale;CGRect scaledRect CGRectApplyAffineTransform(frame, CGAffineTransformMakeScale(scale, scale));CGImageRef cgImage CGImageCreateWithImageInRect(image.CGImage, scaledRect);UIImage *returnImage [UIImage imageWithCGImage:cgImage];CGImageRelease(cgImage);return returnImage;
}以下就是将一个view的上半部分截取成image后展示如下 3.旧方法
func mooSnapshot() - UIImage? {guard CGRectGetWidth(self.bounds) 0.0 CGRectGetHeight(self.bounds) 0.0 else {return nil}UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0.0)let success self.drawHierarchy(in: self.bounds, afterScreenUpdates: true)print(draw success: \(success))let image UIGraphicsGetImageFromCurrentImageContext()UIGraphicsEndPDFContext()return image
}Replace usage of UIGraphicsBeginImageContext with UIGraphicsImageRenderer. Replace usage of UIGraphicsBeginImageContextWithOptions with UIGraphicsImageRenderer. Replace usage of UIGraphicsGetImageFromCurrentImageContext with UIGraphicsImageRendererContext.currentImage. UIGraphicsEndImageContext should only be used alongside UIGraphicsBeginImageContext[WithOptions]. 这些旧的 api 已经被废弃了用文章开头的 api 代替 4.Tips Tips1得在加载到父视图 layout 后触发 Tips2width 或 height 有一个为空 drawHierarchy 就会 crash就版iOS不会crash新版会 参考
drawViewHierarchyInRect:afterScreenUpdates: ios drawViewHierarchyInRect crash EXC_BREAKPOINT UNKNOWN
