objective-c – iphone淡化图像

概述我想要的是在图像视图中显示图像并在5秒后淡化图像并显示下一个图像.图像存储在数组对象中…我能够在5秒后在图像之间成功转换.我想要的是在5秒后淡出第一个图像并显示下一个在无限循环中发生…下面是代码,它对图像之间的正常过渡非常有用..我想要的是图像的褪色…并在下面的代码中添加淡入过渡 - (void)viewDidLoad { imgView.animationImages=[NSArray 我想要的是在图像视图中显示图像并在5秒后淡化图像并显示下一个图像.图像存储在数组对象中…我能够在5秒后在图像之间成功转换.我想要的是在5秒后淡出第一个图像并显示下一个在无限循环中发生…下面是代码,它对图像之间的正常过渡非常有用..我想要的是图像的褪色…并在下面的代码中添加淡入过渡

- (voID)vIEwDIDLoad {    imgVIEw.animationImages=[NSArray arrayWithObjects:                               [UIImage imagenamed:@"lori.png"],[UIImage imagenamed:@"miranda.png"],[UIImage imagenamed:@"taylor.png"],[UIImage imagenamed:@"ingrID.png"],[UIImage imagenamed:@"kasey.png"],[UIImage imagenamed:@"wreckers.png"],nil];    imgVIEw.animationDuration=20.0;    imgVIEw.animationRepeatCount=0;    [imgVIEw startAnimating];    [self.vIEw addSubvIEw:imgVIEw];    [imgVIEw release];    [super vIEwDIDLoad];}

解决方法 您可以使用重复的NSTimer来调用一种特殊的方法,该方法可以连续地将图像视图的Alpha属性设置为0.0到1.0.以下是我编写的一些代码：

- (voID)vIEwDIDLoad {    imgVIEw.animationImages=[NSArray arrayWithObjects:                               [UIImage imagenamed:@"lori.png"],nil];    imgVIEw.animationDuration=20.0;    imgVIEw.animationRepeatCount=0;    [imgVIEw startAnimating];    [self.vIEw addSubvIEw:imgVIEw];    [imgVIEw release];    //The timers time interval is the imageVIEws animation duration devIDed by the number of images in the animationImages array. 20/5 = 4     NSTimer *timer = [NSTimer timerWithTimeInterval:4.0                                               target:self                                             selector:@selector(onTimer)                                             userInfo:nil                                              repeats:YES];    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];    [timer fire];    [super vIEwDIDLoad];}//It is important that the animation durations within these animation blocks add up to 4 //(the time interval of the timer). If you change the time interval then the time intervals //in these blocks must also be changed to refelect the amount of time an image is displayed. //Failing to do this will mean your fading animation will go out of phase with the switching of images.   -(voID)onTimer{        [UIVIEw animateWithDuration:3.0 animations:^{            imgVIEw.Alpha = 0.0;         }];        [UIVIEw animateWithDuration:1.0 animations:^{            imgVIEw.Alpha = 1.0;         }];    }

如果希望淡入淡出持续时间持续5秒而不是4秒,则需要将图像视图animationDuration属性增加到25,然后增加两个块中的淡入淡出动画持续时间,使得淡入淡出时间= 5.

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