Hier ist eine Implementierung einer UILabel Unterklasse, die den Hintergrund programmatisch nachahmt:
UITableViewStandardHeaderLabel.h
#import <UIKit/UIKit.h>
@interface UITableViewStandardHeaderLabel : UILabel
@property (nonatomic) CGFloat topInset;
@property (nonatomic) CGFloat leftInset;
@property (nonatomic) CGFloat bottomInset;
@property (nonatomic) CGFloat rightInset;
@end
UITableViewStandardHeaderLabel.m:
/*!
* @class UITableViewStandardHeaderLabel
* @brief Reimplementation of the UILabel used for a standard UITableView's group headers for customization purposes
*/
@implementation UITableViewStandardHeaderLabel
@synthesize topInset, leftInset, bottomInset, rightInset;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor clearColor];
}
return self;
}
- (void)drawTextInRect:(CGRect)rect
{
UIEdgeInsets insets = {self.topInset, self.leftInset, self.bottomInset, self.rightInset};
return [super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
- (void)drawRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGGradientRef backgroundGradient;
CGColorSpaceRef rgbColorspace;
size_t num_locations = 2;
CGFloat locations[2] = { 0.0f, 1.0f };
CGFloat components[8] = { 144.0f/255.0f, 159.0f/255.0f, 171.0f/255.0f, 1.0f,
/* start */ 183.0f/255.0f, 192.0f/255.0f, 200.0f/255.0f, 1.0f /* end */ };
rgbColorspace = CGColorSpaceCreateDeviceRGB();
backgroundGradient = CGGradientCreateWithColorComponents(rgbColorspace, components, locations, num_locations);
CGRect currentBounds = self.bounds;
CGPoint topCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMinY(currentBounds));
CGPoint bottomCenter = CGPointMake(CGRectGetMidX(currentBounds), CGRectGetMaxY(currentBounds));
CGContextDrawLinearGradient(context, backgroundGradient, topCenter, bottomCenter, 0);
UIColor *topBorderLineColor = [UIColor colorWithRed:113.0f/255.0f green:125.0f/255.0f blue:133.0f/255.0f alpha:1.0];
UIColor *secondLineColor = [UIColor colorWithRed:165.0f/255.0f green:177.0f/255.0f blue:187.0f/255.0f alpha:1.0];
UIColor *bottomBorderLineColor = [UIColor colorWithRed:151.0f/255.0f green:157.0f/255.0f blue:164.0f/255.0f alpha:1.0];
[topBorderLineColor setFill];
CGContextFillRect(context, CGRectMake(0, 0, CGRectGetMaxX(currentBounds), 1));
[bottomBorderLineColor setFill];
CGContextFillRect(context, CGRectMake(0, CGRectGetMaxY(currentBounds)-1, CGRectGetMaxX(currentBounds), 1));
[secondLineColor setFill];
CGContextFillRect(context, CGRectMake(0, 1, CGRectGetMaxX(currentBounds), 1));
[super drawRect:rect];
}
@end
Ich weiß, wie ich meine eigene Header-Zelle implementieren, die ziemlich einfach ist. Ich möchte jedoch genau das Aussehen des standardmäßigen Abschnittsheaderstils für das einfache UITableView von Apple nachahmen. Ich werde meine Frage aktualisieren, um dies zu klären. – Bringo
Wenn Sie es genau nachahmen wollten, bin ich mir nicht sicher, da es sich um UIView-Objekte handelt und nicht um eine eigene Klasse. –
Haben Sie dieses informelle Protokoll angeschaut: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAccessibility_Protocol/Introduction/Introduction.html –