iOS 绘制 cell --- 新手学习笔记

1. 看的一位前辈的记下来的

1.Animal.h 文件中

#import <Foundation/Foundation.h>@interface Animal : NSObject@property (strong, nonatomic) NSString *name;@property (strong, nonatomic) NSString *detail;@property (strong, nonatomic) NSString *imageName;@end

2.Animal.m 文件中

#import "Animal.h"@implementation Animal@end

3.创建一个cell继承UITableViewCell ------HRCell.h

#import <UIKit/UIKit.h>@interface HRCell : UITableViewCell{    UIView *contentView;}- (void)drawContentView:(CGRect)rect;@end

4.创建一个自定义的cell继承 ----HRCell 的 HRCustomCell .h 文件

#import "HRCell.h"@class Animal;@interface HRCustomCell : HRCell@property (weak, nonatomic) NSString *nameText;@property (weak, nonatomic) NSString *detailText;@property (weak, nonatomic) NSString *imageName;- (void)bindAnimal:(Animal *)animal;@end

5.HRCustomCell.m 文件

#import "HRCustomCell.h"#import "Animal.h"#define rNameFontSize 18.0f#define rDetailFontSize 14.0fstatic UIFont *NameFont;static UIFont *DetailFont;@implementation HRCustomCell+ (void)initialize{    NameFont = [UIFont fontWithName:@"American Typewriter" size:rNameFontSize];    DetailFont = [UIFont fontWithName:@"American Typewriter" size:rDetailFontSize];}- (void)bindAnimal:(Animal *)animal{    if (_nameText != animal.name)    {        _nameText = animal.name;    }    if (_detailText != animal.detail)    {        _detailText = animal.detail;    }    if (_imageName != animal.imageName)    {        _imageName = animal.imageName;    }        [self setNeedsDisplay];}- (void)drawContentView:(CGRect)rect{    static UIColor *nameColor;    nameColor = [UIColor blackColor];    static UIColor *detailColor;    detailColor = [UIColor darkGrayColor];        CGContextRef context = UIGraphicsGetCurrentContext();    CGRect cellRect = self.frame;        if (self.highlighted || self.selected)    {        CGContextSetFillColorWithColor(context, [UIColor lightGrayColor].CGColor);        CGContextFillRect(context, CGRectMake(0, 0, cellRect.size.width, cellRect.size.height));    }    else    {        CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);        CGContextFillRect(context, CGRectMake(0, 0, cellRect.size.width, cellRect.size.height));    }        UIImage *image = [UIImage imageNamed:_imageName];    [image drawInRect:CGRectMake(5, 5, 50, 50)];        [nameColor set];    [_nameText drawAtPoint:CGPointMake(65, 10)                  forWidth:200                  withFont:NameFont                  fontSize:rNameFontSize             lineBreakMode:NSLineBreakByWordWrapping        baselineAdjustment:UIBaselineAdjustmentAlignBaselines];        [detailColor set];    [_detailText drawAtPoint:CGPointMake(180, 40)                    forWidth:120                    withFont:DetailFont                    fontSize:rDetailFontSize               lineBreakMode:NSLineBreakByWordWrapping          baselineAdjustment:UIBaselineAdjustmentAlignBaselines];}

6.控制器中的.h 文件

#import <UIKit/UIKit.h>@interface ViewController : UITableViewController@end

7.控制器中的.m文件

#import "ViewController.h"#import "Animal.h"#import "HRCustomCell.h"#define rAnimalCount 100#define rRowHeight 60@interface ViewController (){    NSMutableArray *_animalList;}@endstatic NSString * const CellIdentifier = @"HRCell";@implementation ViewController- (void)loadAnimals{    _animalList = [NSMutableArray arrayWithCapacity:rAnimalCount];    for (NSInteger i = 0; i < rAnimalCount; i++)    {        Animal *animal = [[Animal alloc] init];        NSString *name = [NSString stringWithFormat:@"Animal-%03d", i+1];        NSString *detail = [NSString stringWithFormat:@"dog or cat?"];        NSInteger seed = arc4random()%8 + 1;        NSString *imageName = [NSString stringWithFormat:@"head%02d", seed+1];                animal.name = name;        animal.detail = detail;        animal.imageName = imageName;                [_animalList addObject:animal];    }}- (void)viewDidLoad{    [super viewDidLoad];    [self loadAnimals];    [self.tableView registerClass:[HRCustomCell class] forCellReuseIdentifier:CellIdentifier];    self.title = @"Animals";}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return rRowHeight;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _animalList.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    HRCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];    [cell bindAnimal:_animalList[indexPath.row]];    return cell;}@end