目录
1.1 时钟
1.2 倒计时60秒
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic ,strong)UILabel *timelabel;
@property (nonatomic ,strong)NSString *Str;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.timelabel=[[UILabel alloc]initWithFrame:CGRectMake(20, 100, 300, 30)];
NSDateFormatter *dateFormatter=[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"YYYY-MM-dd hh-mm-ss"];
self.Str=[dateFormatter stringFromDate:[NSDate date]];
self.timelabel.text=self.Str;
[self.view addSubview:self.timelabel];
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeAdd) userInfo:self repeats:YES];
}
- (void)timeAdd
{
//NSDateFormatter 需要封装单例，每次初始化非常耗时
NSDateFormatter *dateFormatter=[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"YYYY-MM-dd hh-mm-ss"];
self.Str=[dateFormatter stringFromDate:[NSDate date]];
self.timelabel.text=self.Str;
}
1.2 倒计时60秒
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic , strong) UIButton *authButton;
@property (nonatomic , assign) int num;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.authButton=[UIButton buttonWithType:UIButtonTypeCustom];
self.authButton.frame =CGRectMake(220, 80, 90, 40);
[self.authButton setBackgroundColor:[UIColor orangeColor]];
[self.authButton setTitle:@"获取验证码" forState:UIControlStateNormal];
self.authButton.titleLabel.textAlignment = NSTextAlignmentCenter;
[self.authButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
self.authButton.titleLabel.font =[UIFont systemFontOfSize:15];
[self.authButton addTarget:self action:@selector(authBtnDown:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.authButton];
}
- (void)authBtnDown:(UIButton *)button
{
//不能直接调用FirstThread
[self performSelectorInBackground:@selector(FirstThread) withObject:nil];
}
- (void)FirstThread
{
if (![NSThread isMainThread]) {
self.num=59;
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange:)
userInfo:nil repeats:YES];
self.authButton.enabled=NO;
[self.authButton setBackgroundColor:[UIColor grayColor]];
[[NSRunLoop currentRunLoop]addTimer:timer forMode:NSDefaultRunLoopMode];
[[NSRunLoop currentRunLoop]run];
}
}
- (void)timeChange:(NSTimer *)tim
{
if (self.num > 0) {
self.authButton.titleLabel.text = [NSString stringWithFormat:@"%d",self.num];
self.num = self.num - 1;
}else{
[tim invalidate];
tim=nil;
self.authButton.enabled = YES;
[self.authButton setBackgroundColor:[UIColor orangeColor]];
}
}
