要求：用多中方法实现定时器
ViewController.h:
#import <UIKit/UIKit.h> #import "NSThread+test.h" @interface DXWViewController : UIViewController - (IBAction)clear:(id)sender; - (IBAction)click1:(id)sender; - (IBAction)click2:(id)sender; - (IBAction)click3:(id)sender; @property(retain,nonatomic) IBOutlet NSTimer *timer; @property (retain, nonatomic) IBOutlet UILabel *label; @property(retain,nonatomic) IBOutlet NSThread *thread; - (IBAction)click4:(id)sender; @end
ViewController.m:
#import "DXWViewController.h"
#define START_BUTTON_Tag 1
#define STOP_BUTTON_Tag 2
@interface DXWViewController ()
@end
@implementation DXWViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_thread = nil;
//为什么不能初始化的时候给label赋值
//self.label = 0;//初始化
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)dealloc {
[_thread release];
[_timer release];
[_label release];
[super dealloc];
}
//多线程调用
int i=0;
BOOL flag = TRUE;
-(void)countT
{
//i=0;
//self.label.text = [NSString stringWithFormat:@"%i",i];
while(flag)
{
//测试
// i++;
// NSLog(@"%d",i);
// NSString *str = [NSString stringWithFormat:@"%i",i];
// NSLog(@"%@",str);
// self.label.text = str;
// [NSThread sleepForTimeInterval:1];
i++;
NSString *str = [NSString stringWithFormat:@"%i",i];
NSLog(@"%@",str);
self.label.text = str;
// CGSize size = [self.label.text sizeWithFont:self.label.font];
// CGRect frame = CGRectMake(self.label.frame.origin.x,self.label.frame.origin.y, size.width,self.label.frame.size.height);
// self.label.frame = frame;
[NSThread sleepForTimeInterval:1];//休眠1秒
}
}
-(void)write
{
NSString *str = [NSString stringWithFormat:@"%i",i];
self.label.text = @"hi";
}
//timer调用的函数
-(void)count:(NSTimer *)_timer
{
i++;
NSString *str = [NSString stringWithFormat:@"%i",i];
self.label.text = str;
CGSize size = [self.label.text sizeWithFont:self.label.font];
CGRect frame = CGRectMake(self.label.frame.origin.x,self.label.frame.origin.y, size.width, self.label.frame.size.height);
NSLog(@"%i",i);
self.label.frame = frame;
}
-(void)getSysDate:(NSTimer *)_timer
{
/* //倒计时
NSCalendar *calendar = [NSCalendar currentCalendar];
//设置目标时间
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setYear:2012];
[components setMonth:8];
[components setDay:13];
[components setHour:12];
[components setMinute:0];
[components setSecond:0];
NSDate *fireDate = [calendar dateFromComponents:components];//目标时间
//当前时间
NSDate *today = [NSDate date];
unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *d = [calendar components:unitFlags fromDate:today toDate:fireDate options:0];//计算时间差
self.label.text = [NSString stringWithFormat:@"%d天%d小时%d%分%d秒", [d day], [d hour], [d minute], [d second]];//倒计时显示
*/
NSDate *date=[NSDate date];
NSDateFormatter *formater=[[[NSDateFormatter alloc] init] autorelease];
//设置日期格式
formater.dateFormat=@"yyyy-MM-dd HH:mm:ss"; //HH大写代表24时制 hh代表12小时制
//把日期变成字符串
NSString *str=[formater stringFromDate:date];
//设置时区
formater.locale=[[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"] autorelease];
//把字符串变成日期
//返回的是格林制时间
date=[formater dateFromString:@"2013-05-16 13:40:50"];
NSLog(@"字符串转化成日期是:%@",date);
NSLog(@"%@",str);
self.label.text = str;
}
- (IBAction)clear:(id)sender {
self.label.text = @"0";
i = 0;
}
- (IBAction)click1:(id)sender {
UIButton *button = (UIButton *)sender;
// 如果是Start则执行start方法
//参数：最后一个参数如果是no则代表计时器执行一次
//_timer = nil;
if (button.tag == START_BUTTON_Tag)
{
if ([_timer isValid]) {
}
else{
_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(count:) userInfo:nil repeats:YES];
}
}
//执行关闭方法
else if (button.tag == STOP_BUTTON_Tag)
{
if (_timer) {
if ([_timer isValid]) {
[_timer invalidate];
}
}
//必须要有这一步操作，不然会报错，指针不用的时候就让他置为空
_timer = nil;
}
}
- (IBAction)click2:(id)sender
{
UIButton *button = (UIButton *)sender;
if(button.tag == START_BUTTON_Tag)
{
//[NSThread sleepForTimeInterval:1];
// _thread = [[[NSThread alloc] initWithTarget:self selector:@selector(countT) object:nil] autorelease];
//获取一个单例
_thread = [NSThread getThread];
[_thread initWithTarget:self selector:@selector(countT) object:nil];
[_thread start];
flag = TRUE;
}
else if (button.tag == STOP_BUTTON_Tag)
{
if (![_thread isCancelled])
{
[_thread cancel];
flag = FALSE;
}
//一旦不用了以后就要指向为空
_thread = nil;
}
}
-(void)test
{
self.label.text = @"1";
}
- (IBAction)click3:(id)sender {
UIButton *button = (UIButton *)sender;
if(button.tag == START_BUTTON_Tag)
{
if ([_timer isValid]) {
}
else{
_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(getSysDate:) userInfo:nil repeats:YES];
}
//怎么调用外面的方法
}
else if(button.tag == STOP_BUTTON_Tag)
{
if (_timer) {
if ([_timer isValid]) {
[_timer invalidate];
}
}
//必须要有这一步操作，不然会报错，指针不用的时候就让他置为空
_timer = nil;
//self.label.text = @"0";
}
}
- (IBAction)click4:(id)sender {
UIButton *button = (UIButton *)sender;
if(button.tag == START_BUTTON_Tag)
{
self.label.text = @"hi";
}
else if(button.tag == STOP_BUTTON_Tag)
{
self.label.text = @"hello";
}
}
@end
xib：
注意要设置成3.5英寸的
放一个label，几组button，分别一一对应，开始和结束
详细源码：http://download.csdn.net/detail/s10141303/5913117
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