Custom cells in TTTableViewController

最新推荐文章于 2023-02-02 20:25:14 发布

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最新推荐文章于 2023-02-02 20:25:14 发布

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本文介绍如何使用Three20框架中的TTTableViewController创建自定义单元格。通过实现HelloTableViewController控制器，定义数据源HelloTableViewDataSource，以及创建数据项HelloTableItem和自定义单元格HelloTableItemCell，实现了带有标题和副标题的自定义单元格。

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转载自：http://three20.pypt.lt/custom-cells-in-tttableviewcontroller

Custom cells in TTTableViewController

Implementation

Table view controller

HelloTableViewController.h

#import <Three20/Three20.h>
#import "HelloTableViewDataSource.h"
 
@interface HelloTableViewController : TTTableViewController {
 
}
 
@end

HelloTableViewController.m

#import "HelloTableViewController.h"
 
@implementation HelloTableViewController
 
- (id)init {
	if (self = [super init]) {
		self.title = @"Hello world table view";
		self.variableHeightRows = YES;
	}
 
	return self;
}
 
- (void)createModel {
	self.dataSource = [[[ArticleListDataSource alloc] init] autorelease];
}
 
@end

Data source for table view controller

HelloTableViewDataSource.h

#import "HelloTableItem.h"
#import "HelloTableItemCell.h"
 
 
@interface HelloTableViewDataSource : TTListDataSource {
 
}
 
@end

HelloTableViewDataSource.m

- (id)init {
 
	if (self = [super init]) {
		self.items = [NSArray arrayWithObjects:
			      [HelloTableItem itemWithTitle:@"First" subtitle:@"Hello #1!"],
			      [HelloTableItem itemWithTitle:@"Second" subtitle:@"Hello #2!"],
			      [HelloTableItem itemWithTitle:@"Third" subtitle:@"Hello #3!"],
			      [HelloTableItem itemWithTitle:@"Fourth" subtitle:@"Hello #4!"],
			      [HelloTableItem itemWithTitle:@"Fifth" subtitle:@"Hello #5!"],
			      nil];
	}
 
	return self;
}
 
- (Class)tableView:(UITableView*)tableView cellClassForObject:(id) object {
 
	if ([object isKindOfClass:[HelloTableItem class]]) {  
		return [HelloTableItemCell class];  
	}
 
	return [super tableView:tableView
	     cellClassForObject:object];
}
 
@end

Data item for a single cell

HelloTableItem.h

@interface HelloTableItem : TTTableLinkedItem {
	NSString *_title;
	NSString *_subtitle;
}
 
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
 
+ (id)itemWithTitle:(NSString *)title
	   subtitle:(NSString *)subtitle;
 
@end

HelloTableItem.m

 
#import "HelloTableItem.h"
 
@implementation HelloTableItem
 
@synthesize title = _title, subtitle = _subtitle;
 
 
+ (id)itemWithTitle:(NSString *)title
	   subtitle:(NSString *)subtitle {
 
	HelloTableItem *item = [[[self alloc] init] autorelease];
	item.title = title;
	item.subtitle = subtitle;
 
	return item;
}
 
 
#pragma mark -
#pragma mark NSObject
 
- (id)init {  
	if (self = [super init]) {  
		_title = nil;
		_subtitle = nil;
	}
 
	return self;
}
 
 
- (void)dealloc {  
	TT_RELEASE_SAFELY(_title);
	TT_RELEASE_SAFELY(_subtitle);
 
	[super dealloc];
}
 
#pragma mark -
#pragma mark NSCoding
 
- (id)initWithCoder:(NSCoder*)decoder {
    if (self = [super initWithCoder:decoder]) {  
        self.title = [decoder decodeObjectForKey:@"title"];
        self.subtitle = [decoder decodeObjectForKey:@"subtitle"];
    }
 
    return self;
}
 
- (void)encodeWithCoder:(NSCoder*)encoder {  
    [super encodeWithCoder:encoder];
 
    if (self.title) {
        [encoder encodeObject:self.title
		       forKey:@"title"];
    }
    if (self.subtitle) {
        [encoder encodeObject:self.subtitle
		       forKey:@"subtitle"];
    }
}
 
@end

Custom cell for a table view

HelloTableItemCell.h

@interface HelloTableItemCell : TTTableLinkedItemCell {
	UILabel *_titleLabel;
	UILabel *_subtitleLabel;
}
 
@end

HelloTableItemCell.m

These NSString methods might be helpful here:

Single line
Multiple lines
- – sizeWithFont:constrainedToSize:
- – sizeWithFont:constrainedToSize:lineBreakMode:

#import "HelloTableItemCell.h"
 
@implementation HelloTableItemCell
 
+ (CGFloat)tableView:(UITableView*)tableView rowHeightForObject:(id)item {  
	// Set the height for the particular cell
	return 85.0;
}
 
- (id)initWithStyle:(UITableViewCellStyle)style
    reuseIdentifier:(NSString*)identifier {
 
	if (self = [super initWithStyle:UITableViewCellStyleValue2
			reuseIdentifier:identifier]) {
		_item = nil;
 
		_titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
		[self.contentView addSubview:_titleLabel];
 
		_subtitleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
		[self.contentView addSubview:_subtitleLabel];
	}
 
	return self;
}
 
 
- (void)dealloc {
	TT_RELEASE_SAFELY(_titleLabel);
	TT_RELEASE_SAFELY(_subtitleLabel);
 
	[super dealloc];
}
 
 
#pragma mark -
#pragma mark UIView
 
- (void)layoutSubviews {
	[super layoutSubviews];
 
	// Set the size, font, foreground color, background color, ...
	[_titleLabel setFrame:CGRectMake(...)];
	// ...
 
	[_subtitleLabel setFrame:CGRectMake(...)];
	// ...
}
 
 
#pragma mark -
#pragma mark TTTableViewCell
 
- (id)object {
	return _item;  
}
 
- (void)setObject:(id)object {
	if (_item != object) {
		[super setObject:object];
 
		HelloTableItem *item = object;
 
		// Set the data in various UI elements
		[_titleLabel setText:item.title];
		[_subtitleLabel setText:item.subtitle];
	}
}
 
@end