我想创建一个带有计时器的 UIButton,如附图所示。我该怎么办? 将 MBProgressHUD 添加到 UIButton 有帮助吗?
(来源:efytimes.com)
最佳答案
我可以向您展示如何绘制代表计时器的圆圈,我相信您可以从那里开始。代码如下:
TimerButton.h
#import <UIKit/UIKit.h>
@interface TimerButton : UIView
{
float currentAngle;
float currentTime;
float timerLimit;
NSTimer *timer;
}
@property float currentAngle;
-(void)stopTimer;
-(void)startTimerWithTimeLimit:(int)tl;
@end
TimerButton.m
#import "TimerButton.h"
@implementation TimerButton
#define DEGREES_TO_RADIANS(degrees) ((3.14159265359 * degrees)/ 180)
#define TIMER_STEP .01
@synthesize currentAngle;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.backgroundColor = [UIColor clearColor];
currentAngle = 0;
}
return self;
}
- (void)drawRect:(CGRect)rect
{
UIBezierPath* aPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(50, 50)
radius:45
startAngle:DEGREES_TO_RADIANS(0)
endAngle:DEGREES_TO_RADIANS(currentAngle)
clockwise:YES];
[[UIColor redColor] setStroke];
aPath.lineWidth = 5;
[aPath stroke];
}
-(void)startTimerWithTimeLimit:(int)tl
{
timerLimit = tl;
timer = [NSTimer scheduledTimerWithTimeInterval:TIMER_STEP target:self selector:@selector(updateTimerButton:) userInfo:nil repeats:YES];
}
-(void)stopTimer
{
[timer invalidate];
}
-(void)updateTimerButton:(NSTimer *)timer
{
currentTime += TIMER_STEP;
currentAngle = (currentTime/timerLimit) * 360;
if(currentAngle >= 360) [self stopTimer];
[self setNeedsDisplay];
}
@end
尝试一下,如果您需要进一步的解释,请告诉我。
关于ios - 带定时器的 UIButton,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11783439/