我正在攻击这个核心动画示例： https://github.com/joericioppo/Shape_05
我想重新启动动画以响应NSThread。 NSLogs按预期显示，但动画本身在所有睡眠完成之前不会触发，即使其方法已被可验证地调用。我该如何每秒重新触发这个动画？
顺便说一下 - 这只是我正在研究的一个示例补丁，以便理解这个概念。我知道动画可以设置为重复，但由于各种原因，这不是我想要做的。这是代码，非常欢迎任何帮助，谢谢。
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface Shape_05ViewController : UIViewController {
CALayer *rootLayer;
CAShapeLayer *shapeLayer;
CGMutablePathRef pentagonPath;
CGMutablePathRef starPath;
int animationCount;
CABasicAnimation *animation;
}
-(void)startAnimation;
-(void) viewDidLoad;
-(void) startSequence;
-(void) enactSequence;
@end
#import "Shape_05ViewController.h"
@implementation Shape_05ViewController
- (void)loadView
{
UIView *appView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
appView.backgroundColor = [UIColor blackColor];
self.view = appView;
[appView release];
rootLayer = [CALayer layer];
rootLayer.frame = self.view.bounds;
[self.view.layer addSublayer:rootLayer];
//Pentagon Path
pentagonPath = CGPathCreateMutable();
CGPoint center = self.view.center;
CGPathMoveToPoint(pentagonPath, nil, center.x, center.y - 75.0);
for(int i = 1; i < 5; ++i) {
CGFloat x = - 75.0 * sinf(i * 2.0 * M_PI / 5.0);
CGFloat y = - 75.0 * cosf(i * 2.0 * M_PI / 5.0);
CGPathAddLineToPoint(pentagonPath, nil,center.x + x, center.y + y);
}
CGPathCloseSubpath(pentagonPath); //This seems to be fixed in 4.0
//Star Path
starPath = CGPathCreateMutable();
center = self.view.center;
CGPathMoveToPoint(starPath, NULL, center.x, center.y + 75.0);
for(int i = 1; i < 5; ++i) {
CGFloat x = 75.0 * sinf(i * 4.0 * M_PI / 5.0);
CGFloat y = 75.0 * cosf(i * 4.0 * M_PI / 5.0);
CGPathAddLineToPoint(starPath, NULL, center.x + x, center.y + y);
};
CGPathCloseSubpath(starPath);
//Create Shape
shapeLayer = [CAShapeLayer layer];
shapeLayer.path = pentagonPath;
UIColor *fillColor = [UIColor colorWithWhite:0.9 alpha:1.0];
shapeLayer.fillColor = fillColor.CGColor;
shapeLayer.fillRule = kCAFillRuleNonZero;
[rootLayer addSublayer:shapeLayer];
}
-(void) viewDidLoad {
NSLog(@"viewDidLoad");
animationCount = 0;
[NSThread detachNewThreadSelector:@selector(startSequence) toTarget:self withObject:nil];
}
-(void) startSequence {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[self enactSequence];
//[NSThread sleepForTimeInterval:100];
[pool release];
}
-(void) enactSequence {
NSLog(@"enactSequence");
for(int i = 0; i < 4; i++) {
[NSThread sleepForTimeInterval:1];
[self performSelector:@selector(startAnimation) withObject:nil];
[rootLayer setNeedsDisplay];
NSLog(@"%i", i);
};
}
-(void)startAnimation
{
NSLog(@"startAnimation");
animation = [CABasicAnimation animationWithKeyPath:@"path"];
animation.duration = 0.25;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.repeatCount = 0;
animation.autoreverses = NO;
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = YES;
if( (animationCount % 2) == 0) {
animation.fromValue = (id)pentagonPath;
animation.toValue = (id)starPath;
} else {
animation.fromValue = (id)starPath;
animation.toValue = (id)pentagonPath;
};
[shapeLayer addAnimation:animation forKey:@"animatePath"];
animationCount++;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)dealloc
{
CGPathRelease(starPath);
CGPathRelease(pentagonPath);
[super dealloc];
}
@end
答案 0 :(得分：0)
好了另一个Google拖网： http://forums.macrumors.com/showthread.php?t=749518&highlight=cabasicanimation
我发现了这个名为NSTimer的东西！对该网站的另一次搜索揭示了一些好消息： How do I use NSTimer?
关于在自己的线程中运行NSTimer： Keep an NSThread containing an NSTimer around indefinitely? (iPhone)
所以现在我可以提供这个更新的代码示例，我希望有一天可能对某人有用。顺便说一句，我还没有尝试过，但显然可以使用以下内容来停止计时器：
[myTimer invalidate];
myTimer = nil;
感谢网站上的所有人，不仅是网页上设计最精美的角落，还有救生员！
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface Shape_05ViewController : UIViewController {
CALayer *rootLayer;
CAShapeLayer *shapeLayer;
CGMutablePathRef pentagonPath;
CGMutablePathRef starPath;
int animationCount;
CABasicAnimation *animation;
NSTimer *repeatingTimer;
}
@property (assign, readwrite) NSTimer *repeatingTimer;
-(void) startAnimation: (NSTimer*)theTimer;
-(void) viewDidLoad;
-(void) startSequence;
@end
#import "Shape_05ViewController.h"
@implementation Shape_05ViewController
@synthesize repeatingTimer;
- (void)loadView
{
UIView *appView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
appView.backgroundColor = [UIColor blackColor];
self.view = appView;
[appView release];
rootLayer = [CALayer layer];
rootLayer.frame = self.view.bounds;
[self.view.layer addSublayer:rootLayer];
//Pentagon Path
pentagonPath = CGPathCreateMutable();
CGPoint center = self.view.center;
CGPathMoveToPoint(pentagonPath, nil, center.x, center.y - 75.0);
for(int i = 1; i < 5; ++i) {
CGFloat x = - 75.0 * sinf(i * 2.0 * M_PI / 5.0);
CGFloat y = - 75.0 * cosf(i * 2.0 * M_PI / 5.0);
CGPathAddLineToPoint(pentagonPath, nil,center.x + x, center.y + y);
}
CGPathCloseSubpath(pentagonPath); //This seems to be fixed in 4.0
//Star Path
starPath = CGPathCreateMutable();
center = self.view.center;
CGPathMoveToPoint(starPath, NULL, center.x, center.y + 75.0);
for(int i = 1; i < 5; ++i) {
CGFloat x = 75.0 * sinf(i * 4.0 * M_PI / 5.0);
CGFloat y = 75.0 * cosf(i * 4.0 * M_PI / 5.0);
CGPathAddLineToPoint(starPath, NULL, center.x + x, center.y + y);
};
CGPathCloseSubpath(starPath);
//Create Shape
shapeLayer = [CAShapeLayer layer];
shapeLayer.path = pentagonPath;
UIColor *fillColor = [UIColor colorWithWhite:0.9 alpha:1.0];
shapeLayer.fillColor = fillColor.CGColor;
shapeLayer.fillRule = kCAFillRuleNonZero;
[rootLayer addSublayer:shapeLayer];
}
-(void) viewDidLoad {
NSLog(@"viewDidLoad");
animationCount = 0;
[NSThread detachNewThreadSelector:@selector(startSequence) toTarget:self withObject:nil];
}
-(void) startSequence {
NSLog(@"startSequence");
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:@selector(startAnimation:)
userInfo:nil
repeats:YES];
[[NSRunLoop currentRunLoop] run];
self.repeatingTimer = timer;
[pool release];
}
-(void)startAnimation: (NSTimer*)theTimer {
NSLog(@"startAnimation");
animation = [CABasicAnimation animationWithKeyPath:@"path"];
animation.duration = 0.25;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.repeatCount = 0;
animation.autoreverses = NO;
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
if( (animationCount % 2) == 0) {
animation.fromValue = (id)pentagonPath;
animation.toValue = (id)starPath;
} else {
animation.fromValue = (id)starPath;
animation.toValue = (id)pentagonPath;
};
[shapeLayer addAnimation:animation forKey:@"animatePath"];
animationCount++;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)dealloc
{
CGPathRelease(starPath);
CGPathRelease(pentagonPath);
[super dealloc];
}
@end