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1.//key值没找到对应的属性，会触发此方法
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
//因为这里的id是系统自带的属性，所以不能在定义的model里，而是要设置成不是系统属性的ID，但是后面要用kvc语句所以model的.m文件先预判即可
if ([key isEqualToString:@"id"]) {
self.ID=value;
}
//key 没有属性对应的key，可以打印查看
NSLog(@"undefined key:%@",key);
}
****注意这里****
[model setValuesForKeysWithDictionary:subDict];
for (NSString *key in subDict) {
id obj = [subDict objectForKey:key];
[model setValue:obj forKey:key];
2.//从自定义xib中加载cell 会触发此方法，在.m文件中自己添加该方法
- (void)awakeFromNib{
NSLog(@"awake!");
//给cell设置选中之后的背景视图
UIView *view = [[UIView alloc] init];
view.backgroundColor = [UIColor lightGrayColor];
//view的frame 会自动设置与cell bounds一致
self.selectedBackgroundView = view;
//self.backgroundView
}
3.图片的圆角设计
iconImageView.layer.masksToBounds = YES;
iconImageView.layer.cornerRadius = 8;
4.UICollectionView
#import "RootViewController.h"
#import "MyCell.h"
#import "CustomView.h"
@interface RootViewController ()
{
//集合视图,iOS6之后出现的视图控件，与UITableView类似,最大的特点是可以对cell实现灵活的布局
//UICollectionView 使用的cell为UICollectionViewCell
UICollectionView *_collectionView;
}
@end
@implementation RootViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
//偏移量重置为0,0
self.automaticallyAdjustsScrollViewInsets = NO;
//UICollectionViewLayout 集合视图的布局类，是一个抽象基类,一般使用它的子类实现对cell的布局
//UICollectionViewFlowLayout 系统提供的，能够实现cell的网格布局
UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc] init];
[flow setScrollDirection:UICollectionViewScrollDirectionVertical];
//设置横向的最小间隔,如果CollectionView垂直滚动能直接生效
flow.minimumLineSpacing = 3;
//设置纵向的最小间隔,CollectionView垂直滚动 实际间隔需要根据item的size 和edgesInsets的值来调节
flow.minimumInteritemSpacing =0;
//利用布局对象，实现集合视图的初始化
//UIScreen 代表手机屏幕类 ，单例
//[UIScreen mainScreen].bounds.size 获取手机屏幕的大小
_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0,64,[UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-64) collectionViewLayout:flow];
_collectionView.delegate = self;
_collectionView.dataSource = self;
//将xib定制的cell提前注册到UICollectionView
//iOS6之后出现的技术，能够提高集合视图的运行效率
[_collectionView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellWithReuseIdentifier:@"cell"];
//[_collectionView registerClass:<#(__unsafe_unretained Class)#> forCellWithReuseIdentifier:<#(NSString *)#>]
//注册CustomView为集合视图的sectionHeaderView,并设置重用标识符
[_collectionView registerClass:[CustomView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"supple"];
//设置SectionFooterView
[_collectionView registerClass:[CustomView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"supple"];
[self.view addSubview:_collectionView];
// Do any additional setup after loading the view.
}
#pragma mark - Delegate
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
NSLog(@"selected item:%d",indexPath.item);
}
#pragma mark - DataSource
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
return 1;
}
//一个section 有多少个Item(cell)
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return 10;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIde = @"cell";
//通过重用标识符和indexPath到UICollectionView的重用队列中获取cell对象，因为已经提前注册了cell，如果获取不到cell对象，UICollectionView会根据注册的cell样式，自动创建cell对象
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIde forIndexPath:indexPath];
//为cell的控件赋值
cell.headerImageView.image = [UIImage imageNamed:@"0.png"];
cell.titleLabel.text = @"test";
return cell;
}
//通过此方法为section的headerView和footerView赋值
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{
static NSString *viewIde = @"supple";
//从重用队列中获取视图，取不到 则自动创建
CustomView *view = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:viewIde forIndexPath:indexPath];
//可以为view赋值
//判断是header还是footer 赋不同的值
if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
view.backgroundColor = [UIColor yellowColor];
}else if ([kind isEqualToString:UICollectionElementKindSectionFooter]){
view.backgroundColor = [UIColor blueColor];
}
return view;
}
#pragma mark - delegate flow layout
//指定每一个item的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
return CGSizeMake(150,120);
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
//如果垂直滚动 view的width与集合视图一致,需要设置高度
return CGSizeMake(30,30);
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section{
return CGSizeMake(30,30);
}
//UIEdgeInsets 描述的是一个视图相对于另一个视图上、左、下、右的距离
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
return UIEdgeInsetsMake(10,8,10,8);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
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原文地址：http://www.cnblogs.com/huanghsh/p/4275817.html
