IOS 矩阵写字 画图

- (void)drawRect:(CGRect)rect
{
    // Drawing code
   CGContextRef context =   UIGraphicsGetCurrentContext();
    [self drawText:context];
    [self drawText2:context];
}
-(void)drawText:(CGContextRef) context{
   
    /***
     默认就是翻转的
    **/
    char * str = "hello World";
    
    CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
    
    CGContextSelectFont(context, "Helvetica" ,18, kCGEncodingMacRoman);
    
    CGContextSetTextDrawingMode(context, kCGTextFill);
    /**
     使用翻转使正过来
     */
   CGAffineTransform myTextTransform = CGAffineTransformMakeScale(1, -1);
   // CGAffineTransform    myTextTransform = CGAffineTransformMakeRotation(1.0);
    CGContextSetTextMatrix(context, myTextTransform);
    
    
    CGContextShowTextAtPoint(context, 50, 50, str, strlen(str));
}
-(void)drawText2:(CGContextRef) context{
    
    NSString *hello = @"ba";
    CGContextSetFillColorWithColor(context, [UIColor blueColor].CGColor);
    [hello drawInRect:CGRectMake(100, 100, 130, 150) withFont:[UIFont systemFontOfSize:18]];
    
}

-(void)drawImg:(CGContextRef) context{
    UIImage *image = [UIImage imageNamed:@"1.jpg"];
    //case1
   // CGContextTranslateCTM(context,0,image.size.height);
    //CGContextScaleCTM(context, 1, -1);
    //CGContextDrawImage(context, CGRectMake(60, -60, image.size.width, image.size.height),image.CGImage) ;
    //case2 
    [image drawInRect:CGRectMake(50, 50, image.size.width, image.size.height)] ;
}