iOS开发中常见的视图和图片处理

释放双眼,带上耳机,听听看~!

 

图片的旋转

是UIImage的扩展类,直接使用UIImage的对象调用即可

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;//表明每行图片数据字节
CGImageAlphaInfo alphaInfo = kCGImageAlphaPremultipliedFirst;//alpha
//配置上下文参数
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旋转
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

图片的裁剪

依然是UIImage的扩展类,直接使用UIImage的对象调用即可

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

获取截屏

截屏是UIView的扩展类

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); //直接保存在相册里,要获取相册权限
}

图片比例处理

依然是UIImage的扩展类

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添加圆角

这里是UIView的扩展类,适用于所有的View,可以设置添加的位置

UIView

@implementation UIView (LSCore)
/**
设置部分圆角 绝对布局
@param corners 需要设置为圆角的角 UIRectCornerTopLeft|UIRectCornerTopRight
@param radii 需要设置的圆角大小 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;
}
/**
设置部分圆角 相对布局
@param corners 需要设置为圆角的角 UIRectCornerTopLeft|UIRectCornerTopRight
@param radii 需要设置的圆角大小 CGSizeMake(5.0, 5.0)
@param rect 需要设置的圆角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为例

UIImage

[image addRoundedCorners:UIRectCornerTopLeft|UIRectCornerTopRight withRadii:CGSizeMake(20.0, 20.0)];

将颜色转为图片

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;
}

图片添加系统滤镜

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];
}

 

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