T#031 – Usiamo Font True Type personali nelle nostre applicazioni iPhone (ttf)

UILabel *hello_label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,200,30)];
[hello_label setFont:[UIFont fontWithName:@"Arial" size:30]];

@interface CustomFontBase : UIView {
NSMutableString *curText;
UIColor *fontColor;
UIColor *bgColor;
int fontSize;
NSString *fontName;
NSString *fontExtension;
float autoSizeWidth;
int glyphOffset;
BOOL isGlowing;
UIColor *glowColor;
}
 
- (void)updateText:(NSString*)newText;
- (void)initTextWithSize:(float)size color:(UIColor*)color bgColor:(UIColor*)bgColor;
- (void)setGlow:(BOOL)glowing withColor:(UIColor*)color;
- (void)autoSizeWidthNow;
 
@property (nonatomic, retain) NSMutableString *curText;
 
@end

#import "CustomFontBase.h"
 
@implementation CustomFontBase
 
@synthesize curText;
 
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// set defaults
[self setBackgroundColor:[UIColor clearColor]];
bgColor = [UIColor clearColor];
[self setCurText: [[NSMutableString alloc] initWithString:@""] ];
fontColor = [UIColor whiteColor];
fontSize = 15;
isGlowing = FALSE;
[self setContentMode:UIViewContentModeTopLeft];  // make sure it doesn't scale/deform when setFrame is called
}
return self;
}
 
- (void)drawRect:(CGRect)rect {
// get context and flip for normal coordinates
CGContextRef context =  UIGraphicsGetCurrentContext();
CGContextTranslateCTM ( context, 0, self.bounds.size.height );
CGContextScaleCTM ( context, 1.0, -1.0 );
 
// Get the path to our custom font and create a data provider.
NSString *fontPath = [[NSBundle mainBundle] pathForResource:fontName ofType:fontExtension];
CGDataProviderRef fontDataProvider = CGDataProviderCreateWithFilename([fontPath UTF8String]);
// Create the font with the data provider, then release the data provider.
CGFontRef customFont = CGFontCreateWithDataProvider(fontDataProvider);
CGDataProviderRelease(fontDataProvider);
// Set the customFont to be the font used to draw.
CGContextSetFont(context, customFont);
 
// prepare characters for printing
NSString *theText = [NSString stringWithString: curText];
int length = [theText length];
unichar chars[length];
CGGlyph glyphs[length];
[theText getCharacters:chars range:NSMakeRange(0, length)];
 
// draw bg
if( bgColor != [UIColor clearColor] )
{
CGRect bgRect = CGRectMake (0, 0, self.bounds.size.width, self.bounds.size.height);
CGContextSetFillColorWithColor( context, bgColor.CGColor );
CGContextFillRect( context, bgRect );
}
 
// Set how the context draws the font, what color, how big.
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetFillColorWithColor(context, fontColor.CGColor );
CGContextSetFontSize(context, fontSize);
 
// set a glow?
if( isGlowing ) {
//CGContextSetShadow(context, CGSizeMake(0,0), 3 );
CGContextSetShadowWithColor( context, CGSizeMake(0,0), 3, glowColor.CGColor );
}
 
// Loop through the entire length of the text.
for (int i = 0; i < length; ++i) {
// Store each letter in a Glyph and subtract the MagicNumber to get appropriate value.
glyphs[i] = [theText characterAtIndex:i] + glyphOffset;
}
 
// draw the glyphs
CGContextShowGlyphsAtPoint( context, 0, 0 + fontSize * .25, glyphs, length ); // hack the y-point to make sure it&#039;s not cut off below font baseline - this creates a perfect vertical fit
 
// get width of text for autosizing the frame later (perhaps)
CGPoint textEnd = CGContextGetTextPosition( context );
autoSizeWidth = textEnd.x;
 
// clean up the font
CGFontRelease( customFont );
}
 
// call this after creating the LandscapeText object to set the styling
- (void)initTextWithSize:(float)size color:(UIColor*)color bgColor:(UIColor*)txtBgColor {
// store font properties
fontColor = color;
fontSize = size;
bgColor = txtBgColor;
 
// autoscale height to font size
[self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, fontSize)];
}
 
// set new text to display
- (void)updateText:(NSString*)newText {
[self setCurText: [NSString stringWithString:newText] ];
[self setNeedsDisplay];
}
 
- (void)setGlow:(BOOL)glowing withColor:(UIColor*)color {
glowColor = color;
isGlowing = glowing;
}
 
- (void)autoSizeWidthNow {
//printf( "autoSizeWidth = %f \n", autoSizeWidth );
[self setFrame:CGRectMake(self.frame.origin.x, self.frame.origin.y, autoSizeWidth, fontSize)];
}
 
- (void)dealloc {
[curText release];
[super dealloc];
}
 
@end

NSMutableString *curText;   //testo da visualizzare
UIColor *fontColor;                 //colore del testo
UIColor *bgColor;                    //colore dello sfondo
int fontSize;                                 //grandezza del font
NSString *fontName;              //nome del font
NSString *fontExtension;    //estensione : nel nostro caso sarà sempre ttf (true type font)
float autoSizeWidth;              //se vogliamo che il testo si adatti alla lunghezza dello spazio disponibile
int glyphOffset;                       //questa e le successive tre properties ci interessano per l'effetto glowing  
BOOL isGlowing;
UIColor *glowColor;

#import "CustomFontBase.h"
 
@interface CustomFontMyFont : CustomFontBase {
 
}
 
@end

#import "CustomFontMyFont.h"
 
@implementation CustomFontMyFont
 
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// Initialization code
fontName = @"NomeDelMioFontParticolare";
fontExtension = @"ttf";
glyphOffset = -29;       
}
return self;
}
 
- (void)dealloc {
[super dealloc];
}
 
@end

#import "CustomFontMyFont.h"
 
........
 
CustomFontMyFont *myLabel = [[[CustomFontMyFont alloc] initWithFrame:CGRectMake(10, 50, 320, 200)] autorelease];
[myLabel initTextWithSize:[slider value]  color:[UIColor whiteColor] bgColor:[UIColor clearColor] ];
[myLabel setGlow:YES withColor:[UIColor yellowColor]];
[myLabel updateText:@"http://www.sviluppoiphoneitalia.com"];