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我在我的UIView子类“Card”中有一个方法,通过将其alpha从1褪为0来消除一个实例。我将类似的东西添加到超级观点,它会淡化。但是当我打电话给fadeAway时,它会立即消失。演示文稿代码位于我的控制器类中。这是我的Card.h和Card.mObjective-c动画块似乎不会触发
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@class Card;
@interface Card : UIView {
int upperOperand;
int lowerOperand;
NSString* theOperator;
int theResult;
}
@property(nonatomic) int upperOperand;
@property(nonatomic) int lowerOperand;
@property(nonatomic, retain) NSString* theOperator;
@property(nonatomic) int theResult;
- (void)fadeAway;
@end
#import "Card.h"
@implementation Card
@synthesize upperOperand;
@synthesize lowerOperand;
@synthesize theOperator;
@synthesize theResult;
- (void)fadeAway {
self.alpha = 1.0f;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:2.0f];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
self.alpha = 0.0f;
[UIView commitAnimations];
[self removeFromSuperview];
}
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
// Initialization code
self.backgroundColor = [UIColor redColor];
self.layer.cornerRadius = 15;
self.alpha = 1.0;
self.layer.borderColor = [[UIColor blueColor] CGColor];
self.layer.borderWidth = 4;
}
return self;
- (void)dealloc {
[super dealloc];
}
@end
你说,[UIView的commitAnimations]行只是_starts_动画,它马上就转到下一行并将其删除?这对我来说很有意义。我已经看到setAnimationDidStopSelector:之前,但还没有尝试过使用它。我认为这意味着另一种方法 - 一个做动画,一个完成后删除视图,对吗? – Steve 2010-07-08 16:04:17
我认为卡勒的回答是正确的,推迟清理到animationDidStopselector :. – Elfred 2010-07-08 16:10:37
没错。那么,或者您可以延迟与动画匹配的延迟。我更新了上面的答案以包含此方法的示例。 – Kalle 2010-07-08 17:15:33