UITextView exclue de la ligne de fond, mais la mauvaise hauteur de ligne

Vous devriez essayer et de tracer vos lignes par programme plutôt que d'utiliser une image. Voici un exemple de code de comment vous pouvez accomplir cela. Vous pouvez sous-classe UITextView et remplacer c'est drawRect: méthode.

NoteView.h

#import <UIKit/UIKit.h>
@interface NoteView : UITextView <UITextViewDelegate> {
}
@end

NoteView.m

#import "NoteView.h"
@implementation NoteView
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor colorWithRed:1.0f green:1.0f blue:0.6f alpha:1.0f];
self.font = [UIFont fontWithName:@"MarkerFelt-Thin" size:19];
}
return self;
}
- (void)drawRect:(CGRect)rect {
//Get the current drawing context   
CGContextRef context = UIGraphicsGetCurrentContext(); 
//Set the line color and width
CGContextSetStrokeColorWithColor(context, [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.2f].CGColor);
CGContextSetLineWidth(context, 1.0f);
//Start a new Path
CGContextBeginPath(context);
//Find the number of lines in our textView + add a bit more height to draw lines in the empty part of the view
NSUInteger numberOfLines = (self.contentSize.height + self.bounds.size.height) / self.font.leading;
//Set the line offset from the baseline. (I'm sure there's a concrete way to calculate this.)
CGFloat baselineOffset = 6.0f;
//iterate over numberOfLines and draw each line
for (int x = 0; x < numberOfLines; x++) {
//0.5f offset lines up line with pixel boundary
CGContextMoveToPoint(context, self.bounds.origin.x, self.font.leading*x + 0.5f + baselineOffset);
CGContextAddLineToPoint(context, self.bounds.size.width, self.font.leading*x + 0.5f + baselineOffset);
}
//Close our Path and Stroke (draw) it
CGContextClosePath(context);
CGContextStrokePath(context);
}
@end

MyViewController.h

#import <UIKit/UIKit.h>
#import "NoteView.h"
@interface MyViewController : UIViewController <UITextViewDelegate> {
NoteView *note;
}
@property (nonatomic, retain) NoteView *note;
@end

MyViewController.m

#import "MyViewController.h"
#import "NoteView.h"
#define KEYBOARD_HEIGHT 216
@implementation MyViewController
@synthesize note;
- (void)loadView {
[super loadView];
self.note = [[[NoteView alloc] initWithFrame:self.view.bounds] autorelease];
[self.view addSubview:note];
note.delegate = self;
note.text = @"This is the first line.\nThis is the second line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\n";
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
[note setNeedsDisplay];
}
- (void)textViewDidBeginEditing:(UITextView *)textView {
CGRect frame = self.view.bounds;
frame.size.height -= KEYBOARD_HEIGHT;
note.frame = frame;
}
- (void)textViewDidEndEditing:(UITextView *)textView {
note.frame = self.view.bounds;
}
- (void)dealloc {
[note release];
[super dealloc];
}

Prendre un coup d'oeil à la documentation d'Apple pour La gestion du Clavier, plus précisément "le Déplacement du Contenu Qui Se Trouve Sous le Clavier". Il explique comment écouter pour NSNotifcations et ajuster votre point de vue correctement.

OriginalL'auteur Adolfo