60秒倒计时

NSTimer方式

@interface TimerButton ()

@property (nonatomic, strong, readwrite) NSTimer *timer;

@property (assign, nonatomic) NSTimeInterval durationToValidity;

@property (strong, nonatomic) UIView *lineView;

@end

@implementation TimerButton

- (instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

self.titleLabel.font = [UIFont systemFontOfSize:14];

self.enabled = YES;

_lineView = [[UIView alloc] initWithFrame:CGRectMake(-10, 5, 0.5, CGRectGetHeight(frame) - 2*5)];

_lineView.backgroundColor = [UIColor redColor];

[self addSubview:_lineView];

}

return self;

}

- (void)setEnabled:(BOOL)enabled{

[super setEnabled:enabled];

UIColor *foreColor = enabled ? [UIColor redColor] : [UIColor greenColor];

[self setTitleColor:foreColor forState:UIControlStateNormal];

if (enabled) {

[self setTitle:@"发送验证码" forState:UIControlStateNormal];

}else if ([self.titleLabel.text isEqualToString:@"发送验证码"]){

[self setTitle:@"正在发送..." forState:UIControlStateNormal];

}

}

- (void)startUpTimer{

_durationToValidity = 60;

if (self.isEnabled) {

self.enabled = NO;

}

[self setTitle:[NSString stringWithFormat:@"%.0f 秒", _durationToValidity] forState:UIControlStateNormal];

self.timer = [NSTimer scheduledTimerWithTimeInterval:1

target:self

selector:@selector(redrawTimer:)

userInfo:nil

repeats:YES];

}

- (void)invalidateTimer{

if (!self.isEnabled) {

self.enabled = YES;

}

[self.timer invalidate];

self.timer = nil;

}

- (void)redrawTimer:(NSTimer *)timer {

_durationToValidity--;

if (_durationToValidity > 0) {

self.titleLabel.text = [NSString stringWithFormat:@"%.0f 秒", _durationToValidity];//防止 button_title 闪烁

[self setTitle:[NSString stringWithFormat:@"%.0f 秒", _durationToValidity] forState:UIControlStateNormal];

}else{

[self invalidateTimer];

}

}

GCD方式

@implementation TimerGCD

- (instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

self.titleLabel.font = [UIFont systemFontOfSize:14];

self.enabled = YES;

}

return self;

}

- (void)startTime {

NSInteger time = 59;

__block NSInteger timeout = time; //倒计时时间

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);

dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), 1.0 * NSEC_PER_SEC, 0); //每秒执行

dispatch_source_set_event_handler(_timer, ^{

if(timeout <= 0) { //倒计时结束，关闭

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^{

self.enabled = YES;

});

} else {

NSInteger seconds = timeout % 60;

NSString *strTime = [NSString stringWithFormat:@"%.2ld", (long)seconds];

dispatch_async(dispatch_get_main_queue(), ^{

[self setTitle:[NSString stringWithFormat:@"重发(%@)",strTime] forState:UIControlStateNormal];

// iOS 7

[self setTitle:[NSString stringWithFormat:@"重发(%@)",strTime] forState:UIControlStateDisabled];

self.enabled = NO;

});

timeout--;

}

});

dispatch_resume(_timer);

}

- (void)setEnabled:(BOOL)enabled{

[super setEnabled:enabled];

UIColor *foreColor = enabled ? [UIColor redColor] : [UIColor greenColor];

[self setTitleColor:foreColor forState:UIControlStateNormal];

if (enabled) {

[self setTitle:@"发送验证码" forState:UIControlStateNormal];

}else if ([self.titleLabel.text isEqualToString:@"发送验证码"]){

[self setTitle:@"正在发送..." forState:UIControlStateNormal];

}

}