用适配器模式处理复杂的UITableView中cell的业务逻辑
适配器是用来隔离数据源对cell布局影响而使用的,cell只接受适配器的数据,而不会与外部数据源进行交互.
源码:
ModelCell.h 与 ModelCell.m
//
// ModelCell.h
// Adapter
//
// Created by XianMingYou on 15/2/10.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
//
#import <UIKit/UIKit.h>
#define NAME_FRAME CGRectMake(15, 15, 290, 20)
#define NAME_FONT [UIFont boldSystemFontOfSize:18.f]
#define ADDRESS_FRAME CGRectMake(15, 15 + 30, 290, 20)
#define ADDRESS_FONT [UIFont systemFontOfSize:14.f]
#define DESCRIBE_FRAME CGRectMake(15, 15 + 60, 290, 20)
#define DESCRIBE_FONT [UIFont italicSystemFontOfSize:14.f]
@interface ModelCell : UITableViewCell
/**
* 适配器处理逻辑的地方
*
* @param adapter 适配器
*/
- (void)accessModelAdapter:(id)adapter;
@end//
// ModelCell.m
// Adapter
//
// Created by XianMingYou on 15/2/10.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
//
#import "ModelCell.h"
#import "ModelAdapter.h"
#import "UIView+SetRect.h"
@interface ModelCell ()
@property (nonatomic, strong) UILabel *name; // 名字
@property (nonatomic, strong) UILabel *address; // 地址
@property (nonatomic, strong) UILabel *describeInfo; // 描述信息
@end
@implementation ModelCell
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
[self createView];
}
return self;
}
- (void)createView {
self.name = [[UILabel alloc] initWithFrame:NAME_FRAME];
self.name.font = NAME_FONT;
self.name.numberOfLines = 0.f;
self.name.textColor = [UIColor redColor];
[self addSubview:self.name];
self.address = [[UILabel alloc] initWithFrame:ADDRESS_FRAME];
self.address.font = ADDRESS_FONT;
self.address.numberOfLines = 0.f;
[self addSubview:self.address];
self.describeInfo = [[UILabel alloc] initWithFrame:DESCRIBE_FRAME];
self.describeInfo.font = DESCRIBE_FONT;
self.describeInfo.numberOfLines = 0.f;
self.describeInfo.textColor = [UIColor grayColor];
self.describeInfo.textAlignment = NSTextAlignmentRight;
[self addSubview:self.describeInfo];
}
- (void)accessModelAdapter:(id)adapter {
ModelAdapter *dataAdapter = adapter;
self.name.text = dataAdapter.name;
self.name.frame = NAME_FRAME;
[self.name sizeToFit];
self.address.text = dataAdapter.address;
self.address.frame = ADDRESS_FRAME;
[self.address sizeToFit];
self.describeInfo.text = dataAdapter.describeInfo;
self.describeInfo.frame = DESCRIBE_FRAME;
[self.describeInfo sizeToFit];
self.describeInfo.x = 320 - self.describeInfo.width - 10;
self.address.y = NAME_FRAME.origin.y + dataAdapter.nameHeight;
self.describeInfo.y = self.address.y + dataAdapter.addressHeight;
}
@endModelAdapter.h 与 ModelAdapter.m
//
// ModelAdapter.h
// Adapter
//
// Created by XianMingYou on 15/2/10.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface ModelAdapter : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *address;
@property (nonatomic, strong) NSString *describeInfo;
// 初始化适配器
- (instancetype)initWithData:(id)data;
#pragma mark 只读属性
@property (nonatomic, readonly) CGFloat nameHeight;
@property (nonatomic, readonly) CGFloat addressHeight;
@property (nonatomic, readonly) CGFloat describeInfoHeight;
@property (nonatomic, readonly) CGFloat totalHeight;
@end设置frame值用的类
UIView+SetRect.h 与 UIView+SetRect.m
//
// UIView+SetRect.h
// TestPch
//
// Created by YouXianMing on 14-12-26.
// Copyright (c) 2014年 YouXianMing. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIView (SetRect)
// Frame
@property (nonatomic) CGPoint viewOrigin;
@property (nonatomic) CGSize viewSize;
// Frame Origin
@property (nonatomic) CGFloat x;
@property (nonatomic) CGFloat y;
// Frame Size
@property (nonatomic) CGFloat width;
@property (nonatomic) CGFloat height;
// Frame Borders
@property (nonatomic) CGFloat top;
@property (nonatomic) CGFloat left;
@property (nonatomic) CGFloat bottom;
@property (nonatomic) CGFloat right;
// Center Point
#if !IS_IOS_DEVICE
@property (nonatomic) CGPoint center;
#endif
@property (nonatomic) CGFloat centerX;
@property (nonatomic) CGFloat centerY;
// Middle Point
@property (nonatomic, readonly) CGPoint middlePoint;
@property (nonatomic, readonly) CGFloat middleX;
@property (nonatomic, readonly) CGFloat middleY;
@property (nonatomic, assign) CGFloat cornerRadius ;
@property (nonatomic ,assign) BOOL round ;
@end//
// UIView+SetRect.m
// TestPch
//
// Created by YouXianMing on 14-12-26.
// Copyright (c) 2014年 YouXianMing. All rights reserved.
//
#import "UIView+SetRect.h"
@implementation UIView (SetRect)
#pragma mark Frame
- (CGPoint)viewOrigin
{
return self.frame.origin;
}
- (void)setViewOrigin:(CGPoint)newOrigin
{
CGRect newFrame = self.frame;
newFrame.origin = newOrigin;
self.frame = newFrame;
}
- (CGSize)viewSize
{
return self.frame.size;
}
- (void)setViewSize:(CGSize)newSize
{
CGRect newFrame = self.frame;
newFrame.size = newSize;
self.frame = newFrame;
}
#pragma mark Frame Origin
- (CGFloat)x
{
return self.frame.origin.x;
}
- (void)setX:(CGFloat)newX
{
CGRect newFrame = self.frame;
newFrame.origin.x = newX;
self.frame = newFrame;
}
- (CGFloat)y
{
return self.frame.origin.y;
}
- (void)setY:(CGFloat)newY
{
CGRect newFrame = self.frame;
newFrame.origin.y = newY;
self.frame = newFrame;
}
#pragma mark Frame Size
- (CGFloat)height
{
return self.frame.size.height;
}
- (void)setHeight:(CGFloat)newHeight
{
CGRect newFrame = self.frame;
newFrame.size.height = newHeight;
self.frame = newFrame;
}
- (CGFloat)width
{
return self.frame.size.width;
}
- (void)setWidth:(CGFloat)newWidth
{
CGRect newFrame = self.frame;
newFrame.size.width = newWidth;
self.frame = newFrame;
}
#pragma mark Frame Borders
- (CGFloat)left
{
return self.x;
}
- (void)setLeft:(CGFloat)left
{
self.x = left;
}
- (CGFloat)right
{
return self.frame.origin.x + self.frame.size.width;
}
- (void)setRight:(CGFloat)right
{
self.x = right - self.width;
}
- (CGFloat)top
{
return self.y;
}
- (void)setTop:(CGFloat)top
{
self.y = top;
}
- (CGFloat)bottom
{
return self.frame.origin.y + self.frame.size.height;
}
- (void)setBottom:(CGFloat)bottom
{
self.y = bottom - self.height;
}
#pragma mark Center Point
#if !IS_IOS_DEVICE
- (CGPoint)center
{
return CGPointMake(self.left + self.middleX, self.top + self.middleY);
}
- (void)setCenter:(CGPoint)newCenter
{
self.left = newCenter.x - self.middleX;
self.top = newCenter.y - self.middleY;
}
#endif
- (CGFloat)centerX
{
return self.center.x;
}
- (void)setCenterX:(CGFloat)newCenterX
{
self.center = CGPointMake(newCenterX, self.center.y);
}
- (CGFloat)centerY
{
return self.center.y;
}
- (void)setCenterY:(CGFloat)newCenterY
{
self.center = CGPointMake(self.center.x, newCenterY);
}
#pragma mark Middle Point
- (CGPoint)middlePoint
{
return CGPointMake(self.middleX, self.middleY);
}
- (CGFloat)middleX
{
return self.width / 2;
}
- (CGFloat)middleY
{
return self.height / 2;
}
- (void)setCornerRadius:(CGFloat)cornerRadius
{
self.layer.masksToBounds = YES ;
self.layer.cornerRadius = cornerRadius ;
}
- (void)setRound:(BOOL)round
{
[self setCornerRadius:self.height/2];
}
- (CGFloat)cornerRadius
{
return self.layer.cornerRadius ;
}
- (BOOL)round
{
return NO ;
}
@end控制器源码:
//
// ViewController.m
// Adapter
//
// Created by XianMingYou on 15/2/10.
// Copyright (c) 2015年 XianMingYou. All rights reserved.
//
#import "ViewController.h"
#import "ModelCell.h"
#import "ModelAdapter.h"
#define REUSE_MODEL_CELL @"ModelCell"
@interface ViewController ()<UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) NSArray *dataArray;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 创建数据源
[self createDataSource];
// 创建tableView
[self createTableView];
}
#pragma mark - 数据源
- (void)createDataSource {
ModelAdapter *data1 = [[ModelAdapter alloc] initWithData:@{@"name" : @"YouXianMing",
@"address" : @"北京通州区果园地铁站附近",
@"describeInfo" : @"iOS Developer"}];
ModelAdapter *data2 = [[ModelAdapter alloc] initWithData:@{@"name" : @"QiuLiang",
@"address" : @"上海浦东XXXX开发园区,德望路园丁小区福星楼7123左侧34桌",
@"describeInfo" : @".Net Developer"}];
ModelAdapter *data3 = [[ModelAdapter alloc] initWithData:@{@"name" : @"",
@"address" : @"上海浦东XXXX开发园区,德望路园丁小区福星楼7123左侧34桌",
@"describeInfo" : @".Net Developer"}];
ModelAdapter *data4 = [[ModelAdapter alloc] initWithData:@{@"name" : @"YouXianMing",
@"address" : @"",
@"describeInfo" : @"C++ Developer"}];
self.dataArray = @[data1, data2, data3, data4];
}
#pragma mark - tableView相关
- (void)createTableView {
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds
style:UITableViewStylePlain];
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.tableView registerClass:[ModelCell class] forCellReuseIdentifier:REUSE_MODEL_CELL];
[self.view addSubview:self.tableView];
}
#pragma mark row的数目
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return self.dataArray.count;
}
#pragma mark 初始化cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
ModelCell *cell = [tableView dequeueReusableCellWithIdentifier:REUSE_MODEL_CELL];
[cell accessModelAdapter:self.dataArray[indexPath.row]];
return cell;
}
#pragma mark cell高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
ModelAdapter *adapter = self.dataArray[indexPath.row];
return adapter.totalHeight;
}
@end简单的分析:
1) 适配器与cell中的控件数据一一对应
2) 重写适配器中的只读属性实现懒加载
3) 适配器与cell共用一部分cell的控件属性,用以方便修改
4) 适配器可以随时切换数据类型
5) 用适配器处理业务逻辑