IOS: DrawRect & amp; CoreText, iosdrawrect

IOS: DrawRect & CoreText, iosdrawrect

-(Void) drawRect :( CGRect) rect {// Drawing code // Quartz 2D painting environment, a canvas CGContextRef context = UIGraphicsGetCurrentContext (); // border circle background circle CGContextSetRGBStrokeColor (context, 1.0, 0, 2.0); // The color CGContextSetLineWidth (context,) of the paint brush line; // The width of the line // void CGContextAddArc (CGContextRef c, CGFloat x, CGFloat y, CGFloat radius, CGFloat startAngle, CGFloat endAngle, int clockwise) 1 radian = 180 °/π (≈ 57.3 °) degrees = radians × 180 °/π 360 ° = 360 × π/18 0 = 2 π radians // x, y is the dot coordinate, radius, startAngle is the start radians, endAngle is the end radians, clockwise 0 is clockwise, 1 is counter-clockwise. CGContextAddArc (context, 120,120,100, 0, 2 * M_PI, 0); // Add a circle CGContextDrawPath (context, kCGPathStroke); // draw the path // proportion of the arc CGContextSetRGBStrokeColor (context, context, 1.0, 0, 3.0); // The color CGContextSetLineWidth (context, 120,120,100) of the paint brush line; // The width of the line CGContextAddArc (context, 180,-90 * M_PI, (endRadius-90) * M_PI/180, 0); // Add a circle CGContextDrawPath (context, kCGPathStroke); // draw the path // draw the string if ([UIDevice currentDevic E] systemVersion]. floatValue> = 7.0) {NSMutableAttributedString * mabstring = [[NSMutableAttributedString alloc] initWithString: drawText]; [mabstring beginEditing]; // set NSMutableDictionary * attributes = [NSMutableDictionary dictionaryWithObject :( id) [UIColor redColor]. CGColor forKey :( id) kCTForegroundColorAttributeName]; // set the font attribute CTFontRef font = CTFontCreateWithName (CFSTR ("Georgia" ), 14, NULL); [attributes setObject :( id) (_ bridge id) font forKey :( id) kCTFontAttributeName]; // underline [mabstring endEditing]; // end Editing [mabstring addAttributes: attributes range: NSMakeRange (0, mabstring. length)]; // start to draw CTFramesetterRef framesetter = reverse (CFAttributedStringRef) mabstring); CGMutablePathRef Path = CGPathCreateMutable (); CGPathAddRect (100,-100, self. bounds. size. width-10, self. bounds. size. height-10); CTFrameRef frame = CTFramesetterCreateFrame (framesetter, CFRangeMake (0, 0), Path, NULL); // press the stack into the graphical state stack. CGContextSetTextMatrix (context, CGAffineTransformIdentity); // Save the current context graphics status. CGContextSaveGState (context); // x, moves CGContextTranslateCTM (context, 0, self. bounds. size. height); // scale x and Y-axis. In the code, the coordinate system transformation is to flip 180 degrees CGContextScaleCTM (context, 1.0,-1.0) along the x axis; CTFrameDraw (frame, context ); // start to draw the CGPathRelease (Path); // start to draw the Path CFRelease (framesetter);} else {// indicates to start to draw the Path CGContextBeginPath (context ); // set the text size CGContextSelectFont (context, "Helvetica", 20, kCGEncodingMacRoman); CGContextSetTextDrawingMode (context, kCGTextFill); // set the text color to white (context, 1.0, 0.0, 1.0, 1.0); // white CGContextSetTextMatrix (context, CGAffineTransformMakeScale (1.0,-1.0); // draw the text CGContextShowTextAtPoint (context, 20,100, [@ "characterAttribute" cStringUsingEncoding: [NSString defaultCStringEncoding], @ "characterAttribute ". length); CGContextStrokePath (context); // indicates the end of the painting path CGContextClosePath (context );} //// // some font attribute settings /////////////// //// // [mabstring addAttribute :( id) kCTFontAttributeName value :( _ bridge id) font range: NSMakeRange (0, 4)]; // [attributes setObject :( id) [NSNumber numberWithInt: kCTUnderlineStyleDouble] forKey :( id) random]; // underline // [mabstring addAttributes: attributes range: NSMakeRange (0, 4)]; // set the text range of the attribute // set italics // CTFontRef font = CTFontCreateWithName (CFStringRef) [UIFont italicSystemFontOfSize: 20]. fontName, 14, NULL); // [mabstring addAttribute :( id) kCTFontAttributeName value :( _ bridge id) (font) range: NSMakeRange (0, 4)];}

The above Code draws a circular proportional chart and text on the UIView.

 

The following shows how to use CoreText on the Label.

1 UILabel * titleLabel = [[UILabel alloc] initWithFrame: CGRectMake (60, 2, sectionHeader. bounds. size. width-60-15-10, 56)]; 2 titleLabel. font = [UIFont systemFontOfSize: 172.16f]; 3 [sectionHeader addSubview: titleLabel]; 4 NSString * titleStr = [NSString stringWithFormat: @ "You still have % ld failed", courseCount]; 5 NSInteger courseCount = [obligatoryCourseArray count]; 6 7 // set the label text 8 NSMutableAttributedString * attrituteString = [[NSMutableAttributedString alloc] initWithString: titleStr]; 9 // set label text attributes 10 [attrituteString setAttributes: @ {NSForegroundColorAttributeName: [UIColor redColor], NSFontAttributeName: [UIFont systemFontOfSize: 25]} range: NSMakeRange (3, [NSString stringWithFormat: @ "% ld", courseCount]. length)]; 11 // displayed on the Label 12 titleLabel. attributedText = attrituteString;

Of course, the Text attribute drawn on the Label can be used in the above method in the UIView.

 

Let's take a look at a UIImageView:

1 {2 3 UIImageView * obligatoryImageView = [[UIImageView alloc] initWithFrame: CGRectMake (0, 30, tableView. bounds. size. width, ([UIScreen mainScreen]. bounds. size. height-20-44)/3-30*2)]; 4 [cell addSubview: obligatoryImageView]; 5 obligatoryImageView. backgroundColor = [UIColor whiteColor]; 6 UIGraphicsBeginImageContext (obligatoryImageView. bounds. size); 7 [obligatoryImageView. image drawInRect: CGRectMake (0, 0, obligatoryImageView. bounds. size. width, obligatoryImageView. bounds. size. height)]; 8 CGContextSetLineCap (UIGraphicsGetCurrentContext (), kCGLineCapRound); // edge style 9 CGContextSetLineWidth (UIGraphicsGetCurrentContext (), 0.2); // 10 rows (), YES); 11 CGContextSetRGBStrokeColor (UIGraphicsGetCurrentContext (), 153/255. 0,153/255.0, 153/255. 0, 1.0); // color 12 CGContextBeginPath (UIGraphicsGetCurrentContext (); 13 CGContextMoveToPoint (partial (), 35, 5); // The starting point coordinate 14 CGContextAddLineToPoint (partial (), self. view. bounds. size. width-35, 5); // The end coordinate 15 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), self. view. bounds. size. width-35, (obligatoryImageView. bounds. size. height-5); 16 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, (obligatoryImageView. bounds. size. height-5); 17 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, 5); 18 19 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, (obligatoryImageView. bounds. size. height-5)/5 + 5); 20 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), self. view. bounds. size. width-35, (obligatoryImageView. bounds. size. height-5)/5 + 5); 21 22 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), self. view. bounds. size. width-35, (obligatoryImageView. bounds. size. height-5)/5*2 + 5); 23 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, (obligatoryImageView. bounds. size. height-10)/5*2 + 5); 24 25 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, (obligatoryImageView. bounds. size. height-10)/5*3 + 5); 26 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), self. view. bounds. size. width-35, (obligatoryImageView. bounds. size. height-10)/5*3 + 5); 27 28 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), self. view. bounds. size. width-35, (obligatoryImageView. bounds. size. height-10)/5*4 + 5); 29 CGContextAddLineToPoint (UIGraphicsGetCurrentContext (), 35, (obligatoryImageView. bounds. size. height-10)/5*4 + 5); 30 31 CGContextStrokePath (UIGraphicsGetCurrentContext (); 32 obligatoryImageView. image = UIGraphicsGetImageFromCurrentImageContext (); 33 UIGraphicsEndImageContext (); 34 35 NSArray * obligatoryArray = [courseArray objectAtIndex: indexPath. row]; 36 37 UILabel * titleLabel = [[UILabel alloc] initWithFrame: CGRectMake (0, 0, tableView. bounds. size. width, 30)]; 38 titleLabel. textColor = [UIColor murpTextLowColor]; 39 titleLabel. textAlignment = NSTextAlignmentCenter; 40 titleLabel. font = [UIFont systemFontOfSize: 15.0f]; 41 titleLabel. text = [[obligatoryArray objectAtIndex: 0] objectForKey: @ "Extend2"]; 42 [cell addSubview: titleLabel]; 43 44 for (int I = 0; I <= 5; I ++) {45 46 UILabel * left1 = [[UILabel alloc] initWithFrame: CGRectMake (0, 30 + (obligatoryImageView. bounds. size. height-10)/5 * I, 35, 10)]; 47 left1.textColor = [UIColor murpTextLowColor]; 48 bytes = NSTextAlignmentRight; 49 left1.font = [UIFont systemFontOfSize: 12.0f]; 50 left1.text = [NSString stringWithFormat: @ "% d %", 100-20 * I]; 51 [cell addSubview: left1]; 52 53 if (I <obligatoryArray. count-1) {54 55 UILabel * down = [[UILabel alloc] initWithFrame: CGRectMake (35 + (tableView. bounds. size. width-35*2)/5 * I, ([UIScreen mainScreen]. bounds. size. height-20-44)/3-30, (tableView. bounds. size. width-35*2)/5, 30)]; 56 down. textColor = [UIColor murpTextLowColor]; 57 down. textAlignment = NSTextAlignmentCenter; 58 down. font = [UIFont systemFontOfSize: 12.0f]; 59 [cell addSubview: down]; 60 down. text = [NSString stringWithFormat: @ "% @", [[obligatoryArray objectAtIndex: I + 1] objectForKey: @ "Extend1"]; 61 62 CGFloat heights = [[[obligatoryArray objectAtIndex: I + 1] objectForKey: @ "Extend3"] floatValue]/100.0 * (obligatoryImageView. bounds. size. height-5*2); 63 UIImageView * heightImageView = [[UIImageView alloc] initWithFrame: CGRectMake (35 + (tableView. bounds. size. width-35*2)/5 * I + 5, ([UIScreen mainScreen]. bounds. size. height-20-44)/3-30-5)-heights, (tableView. bounds. size. width-35*2)/5-10, heights)]; 64 heightImageView. backgroundColor = [UIColor Preview]; 65 [cell addSubview: heightImageView]; 66 67 UILabel * heightsLabel = [[UILabel alloc] initWithFrame: CGRectMake (35 + (tableView. bounds. size. width-35*2)/5 * I + 5, ([UIScreen mainScreen]. bounds. size. height-20-44)/3-30-5)-heights-20, (tableView. bounds. size. width-35*2)/5-10, 20)]; 68 heightsLabel. textColor = [UIColor murpTextLowColor]; 69 heightsLabel. textAlignment = NSTextAlignmentCenter; 70 heightsLabel. font = [UIFont systemFontOfSize: 10.0f]; 71 [cell addSubview: heightsLabel]; 72 heightsLabel. text = [[obligatoryArray objectAtIndex: I + 1] objectForKey: @ "Extend2"]; 73} 74} 75}

 

Actually, I don't know what I want to say. Hey, let's see the final effect: