- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
//保存初始狀態(tài)（壓棧操作，保存一份當(dāng)前圖形上下文）
CGContextSaveGState(context);
//圖形上下文移動(dòng){x,y}
CGContextTranslateCTM(context, 50.0, 80.0);
//圖形上下文縮放{x,y}
CGContextScaleCTM(context, 0.9, 0.9);
//旋轉(zhuǎn)
CGContextRotateCTM(context, M_PI_4 / 4);
//需要繪制的圖片
UIImage *image = [UIImage imageNamed:@"512"];
CGRect rectImage = CGRectMake(0.0, 0.0, rect.size.width, (rect.size.width*image.size.height/image.size.width));
//三種方式繪制圖片
// 1撤缴、在rect范圍內(nèi)完整顯示圖片-正常使用
[image drawInRect:rectImage];
// [image drawAtPoint:CGPointMake(0, 0)];
// 2短绸、圖片上下顛倒
// CGContextDrawImage(context, rectImage, image.CGImage);
// 3、圖片上下顛倒并拼接填充
// CGContextDrawTiledImage(context, rectImage, image.CGImage);
//恢復(fù)到初始狀態(tài)（出棧操作嗦嗡，恢復(fù)一份當(dāng)前圖形上下文）
NSString *text = @"123456789";
[text drawAtPoint:CGPointMake(10, 10) withAttributes:@{NSForegroundColorAttributeName : [UIColor blueColor], NSFontAttributeName : [UIFont systemFontOfSize:29]}];
CGContextRestoreGState(context);
}
或者
- (UIImage *)complexText
{
UIImage *image = self.centerShow.image;
CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
// CGContextTranslateCTM(context, 0, rect.size.height);
// CGContextScaleCTM(context, 1.0, -1.0);
//繪制圖片
// CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), image.CGImage);
[image drawInRect:CGRectMake(0, 0, rect.size.width, rect.size.height)];
//做CTM變換
// CGContextScaleCTM(context, 1.0, -1.0);
// CGContextTranslateCTM(context, 0, -rect.size.height);
// for (JHIdentifyText *obj in self.identifyTextArr) {
NSString *text = @"123456789";
[text drawAtPoint:CGPointMake(10, 10) withAttributes:@{NSForegroundColorAttributeName : [UIColor blueColor], NSFontAttributeName : [UIFont systemFontOfSize:29]}];
// }
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newPic;
}
