iOS基礎之UIImageView（二）

標籤：cgimage   imageview   wim   row   des   圖片圓角   pat   bsp   save   

1 UIImage 任意角度旋轉

#import "UIImage+ImageRotate.h"#import <QuartzCore/QuartzCore.h>#import <Accelerate/Accelerate.h>@implementation UIImage (ImageRotate)/** UIImage 任意角度旋轉 1 將圖片渲染到上下文 context 2 將 context 旋轉一定的角度 3 將旋轉之後的 context 轉化為 UIImage */- (UIImage *)imageRaotateIndegree:(float)degree {    // 1 將圖片渲染到上下文 context    size_t width = (size_t)self.size.width * self.scale;    size_t height = (size_t)self.size.height * self.scale;        // 每行圖片資料位元組    size_t bytesPerRow = width * 4;    // Alpha 色板    CGImageAlphaInfo alphaInfo = kCGImageAlphaPremultipliedFirst;    // 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 將 context 旋轉一定的角度    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);    // 3 將旋轉之後的 context 轉化為 UIImage    CGImageRef rotateImageRef = CGBitmapContextCreateImage(bmContext);    UIImage *rotateImage = [UIImage imageWithCGImage:rotateImageRef scale:self.scale orientation:UIImageOrientationUp];    return rotateImage;}@end

2 圖片任意位置裁剪

#import "UIImage+ImageCut.h"/** 圖片任意位置裁剪 */- (UIImage *)imageCutSize:(CGRect)rect {    // 1 將需要剪下的部分取出來    CGImageRef subImageRef = CGImageCreateWithImageInRect(self.CGImage, rect);    CGRect smallRect = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef));    // 2 將圖片繪製到上下文中    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextDrawImage(context, rect, subImageRef);    // 3 將當前上下文儲存為UIImage    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}@end

3 圖片圓角剪下

#import "UIImage+ImageCircle.h"@interface view: UIView@property (nonatomic, strong) UIImage *image;@end@implementation view- (void)drawRect:(CGRect)rect {    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSaveGState(context);    CGContextAddEllipseInRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height));    CGContextClip(context);    CGContextFillPath(context);    [_image drawAtPoint:CGPointMake(0, 0)];    CGContextRestoreGState(context);}@end@implementation UIImage (ImageCircle)/** 圖片圓角剪下 */- (UIImage *)imageClipCircle {    CGFloat imageSizeMin = MIN(self.size.width, self.size.height);    CGSize imageSize = CGSizeMake(imageSizeMin, imageSizeMin);        view *mView = [[view alloc] init];    mView.image = self;        UIGraphicsBeginImageContext(imageSize);    CGContextRef context = UIGraphicsGetCurrentContext();    mView.frame = CGRectMake(0, 0, imageSizeMin, imageSizeMin);    mView.backgroundColor = [UIColor whiteColor];    [mView.layer renderInContext:context];        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}@end

4 圖片任意展開

#import "UIImage+ImageScale.h"@implementation UIImage (ImageScale)/** 圖片任意展開 */- (UIImage *)imageScaleSize:(CGSize)size {    UIGraphicsBeginImageContext(size);    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}@end

5 螢幕截屏

#import "UIView+ImageScreenShot.h"@implementation UIView (ImageScreenShot)/** 螢幕截屏 */- (UIImage *)imageScreenShot {    UIGraphicsBeginImageContext(self.frame.size);        CGContextRef context = UIGraphicsGetCurrentContext();    [self.layer renderInContext:context];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();    return image;}@end

6 圖片添加文字及logo浮水印效果

#import "UIImage+ImageWaterPrint.h"@implementation UIImage (ImageWaterPrint)/** 圖片添加文字及logo浮水印效果 */- (UIImage *)imageWater:(UIImage *)imageLogo waterString:(NSString *)waterString {    UIGraphicsBeginImageContext(self.size);    // 1 原始圖片渲染    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];        // 2 將logo渲染到右下角    [imageLogo drawInRect:CGRectMake(self.size.width - 20, self.size.height - 20, 16, 16)];        // 3 將文字渲染到左上方    NSMutableParagraphStyle *paragraphStype = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];    paragraphStype.lineBreakMode = NSLineBreakByCharWrapping;    NSDictionary *dict = @{NSFontAttributeName: [UIFont systemFontOfSize:20],                           NSForegroundColorAttributeName: [UIColor redColor],                           NSParagraphStyleAttributeName: paragraphStype};    [waterString drawInRect:CGRectMake(0, 0, 300, 50) withAttributes:dict];        // 4 將當前上下文儲存為UIImage    UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();    return imageNew;}@end

 

iOS基礎之UIImageView（二）