标签：run integer nsdate mod cto 记录 tla nsrunloop sha
自己稍微记录一下，方便以后用到：
先创建一个定时器的类：
#import "TimeCenter.h" @interface TimeCenter () @property (nonatomic, assign) NSInteger timeInterval;// 累计时间 @property (nonatomic, strong) NSTimer *timer; @end @implementation TimeCenter + (instancetype)shareCenter { static TimeCenter *instance; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ instance = [[TimeCenter alloc]init]; }); return center; } //启动 - (void)start { NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timerEvent) userInfo:nil repeats:YES]; self.timer=timer; [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; } //停止 - (void)stop { if (_timer != nil) { [self.timer invalidate]; } } //事件 - (void)timerEvent { if (_timer != nil) { self.timeInterval++; } }
在控制器创建的时候开始定时器，
然后在cell中添加kvo 监听事件：
@implementation TableViewCell
+ (instancetype)cellWithTableView:(UITableView *)tableView{
static NSString *ID = @"tableViewCell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
if (cell == nil) {
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
}
return cell;
}
- (id)initWithStyle:(UITableViewCellStyle)style
reuseIdentifier:(NSString *)reuseIdentifier{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
//第二种：KVO监听
[[TimeCenter shareCenter] addObserver:self
forKeyPath:@"timeInterval"
options:NSKeyValueObservingOptionOld
|NSKeyValueObservingOptionNew
context:nil];
}
return self;
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context{
if ([keyPath isEqual:@"timeInterval"]) {
[self reloadCell];
}
}
- (void)setTimeModel:(TimeModel *)timeModel{
_timeModel=timeModel;
[self reloadCell];
}
- (void)reloadCell{
NSDate *date = [NSDate dateWithTimeIntervalSinceNow:0];
NSInteger time = [date timeIntervalSince1970];
NSInteger leftTime = [self.timeModel.time integerValue] - time;
if (leftTime <0){
self.textLabel.text =@"已结束";
}else{
self.textLabel.text = [NSString stringWithFormat:@"剩余%ld天%02ld:%02ld:%02ld", leftTime/(60*60*24),
(leftTime/3600)%24,
(leftTime/60)%60,
leftTime%60];
}
}
- (void)dealloc
{
[[TimeCenter shareCenter] removeObserver:self
forKeyPath:@"timeInterval"];
标签：run integer nsdate mod cto 记录 tla nsrunloop sha
原文地址：http://www.cnblogs.com/liuwenqiang/p/6660270.html
