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前言
眾所周知在開發中不可避免的會遇到一些圖片和視圖的處理，我這里總結的這些只是我遇到的一些，以供下次使用查看。下面話不多說了，來一起看看詳細的介紹吧。
圖片的旋轉
是UIImage的擴展類，直接使用UIImage的對象調用即可
UIImage
#import <QuartzCore/QuartzCore.h>
#import <Accelerate/Accelerate.h>
@implementation UIImage (ImageRotate)
-(UIImage *)imageRotateIndegree:(float)degree{
//1.image-》context
size_t width = (size_t)(self.size.width *self.scale);
size_t height = (size_t)(self.size.height*self.scale);
size_t bytesPerRow = width * 4;//表明每行圖片數據字節
CGImageAlphaInfo alphaInfo = kCGImageAlphaPremultipliedFirst;//alpha
//配置上下文參數
CGContextRef bmContext = CGBitmapContextCreate(NULL, width, height, 8, bytesPerRow, CGColorSpaceCreateDeviceRGB(), kCGBitmapByteOrderDefault | alphaInfo);
if (!bmContext) {
return nil;
}
CGContextDrawImage(bmContext, CGRectMake(0, 0, width, height), self.CGImage);
//2旋轉
UInt8 *data = (UInt8*)CGBitmapContextGetData(bmContext);
vImage_Buffer src = {data,height,width,bytesPerRow};
vImage_Buffer dest = {data,height,width,bytesPerRow};
Pixel_8888 bgColor = {0,0,0,0};
vImageRotate_ARGB8888(&src, &dest, NULL, degree, bgColor, kvImageBackgroundColorFill);
//3context-》UIImage
CGImageRef rotateImageref = CGBitmapContextCreateImage(bmContext);
UIImage *rotateImage = [UIImage imageWithCGImage:rotateImageref scale:self.scale orientation:self.imageOrientation];
return rotateImage;
}
@end
圖片的裁剪
依然是UIImage的擴展類，直接使用UIImage的對象調用即可
UIImage
@implementation UIImage (ImageCut)
-(UIImage *)ImageCutSize:(CGRect)rect{
CGImageRef subImageref = CGImageCreateWithImageInRect(self.CGImage, rect);
CGRect smallRef = CGRectMake(0, 0, CGImageGetWidth(subImageref), CGImageGetHeight(subImageref));
UIGraphicsBeginImageContext(smallRef.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawImage(context, smallRef, subImageref);
UIImage *image = [UIImage imageWithCGImage:subImageref];
UIGraphicsEndImageContext();
return image;
}
@end
獲取截屏
截屏是UIView的擴展類
UIView
@implementation UIView (imageScreenShot)
- (UIImage *)imageScreenShot
{
UIGraphicsBeginImageContext(self.frame.size);
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageNew;
}
@end
使用方法
UIView
- (void)imageScreen{
UIImage *imageNew = [self.view imageScreenShot];
UIImageWriteToSavedPhotosAlbum(imageNew, nil, nil, nil); //直接保存在相冊里，要獲取相冊權限
}
圖片比例處理
依然是UIImage的擴展類
UIImage
@implementation UIImage (imageScaleSize)
- (UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize{
UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));
[image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage;
}
@end
view添加圓角
這里是UIView的擴展類，適用于所有的View，可以設置添加的位置
UIView
@implementation UIView (LSCore)
/**
設置部分圓角 絕對布局
@param corners 需要設置為圓角的角 UIRectCornerTopLeft|UIRectCornerTopRight
@param radii 需要設置的圓角大小 CGSizeMake(5.0, 5.0)
*/
- (void)addRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii{
UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:radii];
CAShapeLayer *shape = [[CAShapeLayer alloc] init];
[shape setPath:rounded.CGPath];
self.layer.mask = shape;
}
/**
設置部分圓角 相對布局
@param corners 需要設置為圓角的角 UIRectCornerTopLeft|UIRectCornerTopRight
@param radii 需要設置的圓角大小 CGSizeMake(5.0, 5.0)
@param rect 需要設置的圓角view的rect
*/
- (void)addRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii viewRect:(CGRect)rect{
UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:radii];
CAShapeLayer *shape = [[CAShapeLayer alloc] init];
[shape setPath:rounded.CGPath];
self.layer.mask = shape;
}
@end
使用方法以UIImageView為例
UIImage
[image addRoundedCorners:UIRectCornerTopLeft|UIRectCornerTopRight withRadii:CGSizeMake(20.0, 20.0)];
將顏色轉為圖片
UIImage
-(UIImage *)ImageForColor:(UIColor *)color{
CGRect rect = CGRectMake(0.0f, 0.0f, 10, 10);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
圖片添加系統濾鏡
UIImage
-(UIImage *)blurryImage:(UIImage *)image
withBlurLevel:(CGFloat)blur {
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];
CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"
keysAndValues:kCIInputImageKey, inputImage,
@"inputRadius", @(blur),
nil];
CIImage *outputImage = filter.outputImage;
CGImageRef outImage = [context createCGImage:outputImage
fromRect:[outputImage extent]];
return [UIImage imageWithCGImage:outImage];
}
總結
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對億速云的支持。
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