1:将自定义对象转化成NsData存入数据库
要转为nsdata自定义对象要遵循<NSCoding>的协议,然后实现encodeWithCoder，initwithcode对属性转化,实例如下: HMShop.h
#import <Foundation/Foundation.h> @interface HMShop : NSObject <NSCoding>
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) double price;
@end HMShop.m
#import "HMShop.h" @implementation HMShop
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:self.name forKey:@"name"];
[encoder encodeDouble:self.price forKey:@"price"];
} - (id)initWithCoder:(NSCoder *)decoder
{
if (self = [super init]) {
self.name = [decoder decodeObjectForKey:@"name"];
self.price = [decoder decodeDoubleForKey:@"price"];
}
return self;
} - (NSString *)description
{
return [NSString stringWithFormat:@"%@ <-> %f", self.name, self.price];
}
@end 操作: - (void)addShops
{
NSMutableArray *shops = [NSMutableArray array];
for (int i = ; i<; i++) {
HMShop *shop = [[HMShop alloc] init];
shop.name = [NSString stringWithFormat:@"商品--%d", i];
shop.price = arc4random() % ; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:shop];
[self.db executeUpdateWithFormat:@"INSERT INTO t_shop(shop) VALUES (%@);", data];
}
} - (void)readShops
{
FMResultSet *set = [self.db executeQuery:@"SELECT * FROM t_shop LIMIT 10,10;"];
while (set.next) {
NSData *data = [set objectForColumnName:@"shop"];
HMShop *shop = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@"%@", shop);
}
} ＊把对象转成nsdata的理由，因为在存入数据库时会变成字符串，不利转化，所以先把其序列化转化成nsdata，然后存进数据库，取出时同样先为nsdata再转化；
2:增加子控制器，用来提取一些公共的内容布局，瘦身当前viewcontroller
DetailsViewController *details = [[DetailsViewController alloc] init];
details.photo = self.photo;
details.delegate = self;
[self addChildViewController:details];
CGRect frame = self.view.bounds;
frame.origin.y = ;
details.view.frame = frame;
[self.view addSubview:details.view];
[details didMoveToParentViewController:self];
3:用协议来分离出调用
在子控制器创建一个协议，然后在其内部对它进行处理传参 子控制器.h
@protocol DetailsViewControllerDelegate - (void)didSelectPhotoAttributeWithKey:(NSString *)key; @end @interface DetailsViewController : UITableViewController @property (nonatomic, strong) Photo *photo;
@property (nonatomic, weak) id <DetailsViewControllerDelegate> delegate; @end 子控制器.m - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *key = self.keys[(NSUInteger) indexPath.row];
//对它进行传参，让其在父控制器去实现
[self.delegate didSelectPhotoAttributeWithKey:key];
} 父控制器.m
@interface PhotoViewController () <DetailsViewControllerDelegate>
@end 然后(得到参数，进行原本子控制器要进行的操作)：
- (void)didSelectPhotoAttributeWithKey:(NSString *)key
{
DetailViewController *detailViewController = [[DetailViewController alloc] init];
detailViewController.key = key;
[self.navigationController pushViewController:detailViewController animated:YES];
}
4:关于kvo的运用
//进度值改变 增加kvo 传值 key为fractionCompleted
- (void)setProgress:(NSProgress *)progress{
if (_progress) {
[_progress removeObserver:self forKeyPath:@"fractionCompleted"];
}
_progress = progress;
if (_progress) {
[_progress addObserver:self forKeyPath:@"fractionCompleted" options:NSKeyValueObservingOptionNew context:nil];
}
}
//消息kvo消息
- (void)dealloc{
if (_progress) {
[_progress removeObserver:self forKeyPath:@"fractionCompleted"];
}
_progress = nil;
} #pragma mark KVO
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
if ([keyPath isEqualToString:@"fractionCompleted"]) {
NSProgress *progress = (NSProgress *)object;
NSProgress *cellProgress = _offsourecebean.cDownloadTask.progress;
BOOL belongSelf = NO;
if (cellProgress && cellProgress == progress) {
belongSelf = YES;
}
dispatch_async(dispatch_get_main_queue(), ^{
if (self) {
[self showProgress:progress belongSelf:belongSelf];
}
});
} else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
} ＊注意增加监听后在不用时要进行消除，移除观察，其中addObserver可以是其它对象，然后在其内部实现observeValueForKeyPath这个协议；增加监听时可以设置options类型，也可以多类型一起；比如NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld;当被监听的对象发生变化时，会马上通知监听对象，使它可以做出一些响应，比如视图的更新；
5:自定义UITableViewCell的accessoryView 判断哪个Button按下
UITableview的开发中经常要自定义Cell右侧的AccessoryView，把他换成带图片的按钮，并在用户Tap时判断出是哪个自定义按钮被按下了。 创建自定义按钮，并设为AccessoryView
if (cell == nil) {
cell = [[UITableView alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier]; UIImage *image= [ UIImage imageNamed:@"delete.png" ];
UIButton *button = [ UIButton buttonWithType:UIButtonTypeCustom ];
CGRect frame = CGRectMake( 0.0 , 0.0 , image.size.width , image.size.height );
button. frame = frame;
[button setBackgroundImage:image forState:UIControlStateNormal ];
button. backgroundColor = [UIColor clearColor ];
[button addTarget:self action:@selector(buttonPressedAction forControlEvents:UIControlEventTouchUpInside];
cell. accessoryView = button;
} 如果将Button加入到cell.contentView中，也是可以的。
cell.contentView addSubview:button]; 在Tap时进行判断，得到用户Tap的Cell的IndexPath
- (void)buttonPressedAction id)sender
{
UIButton *button = (UIButton *)sender;
(UITableViewCell*)cell = [button superview];
int row = [myTable indexPathForCell:cell].row;
} 对于加到contentview里的Button
(UITableViewCell*)cell = [[button superview] superview];
6:直接运用系统自带的UITableViewCell，其中cell.accessoryView可以自定义控件
#import "MyselfViewController.h" @interface MyselfViewController () @property (nonatomic, retain) NSMutableArray *datasource; @end @implementation MyselfViewController
-(void)dealloc {
[_datasource release];
[super dealloc];
} -(NSMutableArray *)datasource {
if (!_datasource) {
self.datasource = [NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"MyselfList" ofType:@"plist"]];
}
return _datasource;
} -(instancetype)init {
self = [super initWithStyle:UITableViewStyleGrouped];
if (self) { }
return self;
} - (void)viewDidLoad {
[super viewDidLoad]; [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
self.tableView.rowHeight = ;
self.navigationItem.title = @"我的";
} - (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
} #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return self.datasource.count;
} - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section.
return [self.datasource[section] count];
} - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
NSDictionary *dict = [self.datasource[indexPath.section] objectAtIndex:indexPath.row];
cell.textLabel.text = dict[@"title"];
cell.imageView.image = [UIImage imageNamed:dict[@"imageName"]]; if (indexPath.section == && indexPath.row == ) {
cell.accessoryView = [[[UISwitch alloc] init] autorelease];
} else {
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
} return cell;
} @end