(IPhone/iPad Development) Draw text on UIView

I checked the information online. There are two methods:

 

Method 1: Use the Z plotting method:

-(Void) drawText :( NSString *) text x :( float) x y :( float) y {

CGContextRef context = UIGraphicsGetCurrentContext ();

CGContextSelectFont (context, "Arial", 20, kCGEncodingMacRoman );

CGContextSetTextDrawingMode (context, kCGTextFill );

CGAffineTransform xform = CGAffineTransformMake (1.0, 0.0, 0.0,-1.0, 0.0, 0.0 );

CGContextSetTextMatrix (context, xform );

CGContextSetTextPosition (context, x, y + 20); // 20 is y-axis offset pixels

CGContextShowText (context, [text UTF8String], strlen ([text UTF8String]);

}

 

Method 2: Use the drawAtPoint method of NSString

-(Void) drawText2 :( NSString *) text x :( float) x y :( float) y {

UIFont * font = [UIFont fontWithName: @ "Arial" size: 20];

[Text drawAtPoint: CGPointMake (x, y) withFont: font];

}

 

Darw code in UIView class

-(Void) drawRect :( CGRect) rect {

CGContextRef context = UIGraphicsGetCurrentContext ();

CGContextSetFillColorWithColor (context, [UIColor blueColor]. CGColor );

NSString * text = @ "Hello World! ";

[Self drawText: text x: 50 y: 0];

[Self drawText2: text x: 50 y: 30];

}

Both methods can be used, but the second method has lower performance than the first method.

 

From andy Pan's column