UIScrollView＋2个效果。

研究了切换效果。自己写了2个：一个是用UIView淡入。。。一个是用CATransition（加入须QuartzCore.framework）;

UIView 是子视图逐个淡入，但是效果不太好。可能时间设计不好，还是有其他更佳方法，还请各为不惜赐教。

CATransition 是随机交换各个对象。其实就是随机分配背景图，在根据背景图名称，给按钮设计Tag值。

让各位见笑了：

UI- (void)viewDidAppear:(BOOL)animated

{
//不要scrollView 请注释此句。
[(UIScrollView*)self.viewsetContentSize:CGSizeMake(320, 450)];    NSMutableArray * arr =[[NSMutableArrayalloc]init];
    float offset = 10;
    int cellPadingY=10;
    for (int i = 0; i < 9; i++) 
    {
        CGRect rect = CGRectMake(offset, cellPadingY, 90, 90);
        button = [[UIButton alloc]initWithFrame:rect];
        [buttonsetTitle:[[NSStringalloc]initWithFormat:@"btn%i",i] forState:UIControlStateNormal];
        [buttonsetTitleColor:[UIColorredColor] forState:UIControlStateNormal];
        [buttonaddTarget:selfaction:@selector(buttonOnClick:) forControlEvents:UIControlEventTouchUpInside];
        //button.backgroundColor = [UIColor clearColor];
        if (i%2==0) {
            [buttonsetBackgroundImage:[UIImageimageNamed:@"2.jpg"]forState:UIControlStateNormal];
        }
        else[buttonsetBackgroundImage:[UIImageimageNamed:@"1.jpg"]forState:UIControlStateNormal];
        button.alpha=0;
        //为后面按钮的视图控制器做准备。。。。
        button.tag = i+ 100; //加上100 以免跟其它tag一样 
        [self.view  addSubview:button];
        [arr addObject:button];
        offset += 90 + 15;
        if(offset>320){
            offset=10;
            cellPadingY+=100;
        }   
    }
    
    NSMutableArray *arrTime=[[NSMutableArrayalloc]initWithObjects:@"1",@"2",@"2.5",@"3",@"3.5",@"4",@"4.5",@"5",@"5.5" ,nil];
    int m = [arrTime count];  
    while(--m > 0) {  
        int n = rand()%(m+1);  
        [arrTime exchangeObjectAtIndex:m withObjectAtIndex:n];
    }
    [UIViewbeginAnimations:@"moive"context:nil];
    for (int i=0; i<[arr count]; i++) {
        [UIViewsetAnimationDuration:[[arrTime objectAtIndex:i]  intValue]];
        [UIViewsetAnimationCurve:UIViewAnimationCurveEaseIn];
        //Make the animatable changes.
        [[arr objectAtIndex:i]setAlpha:1];
    }
    [UIViewcommitAnimations];
　　[super viewDidAppear:animated];
}

 

//－－－－－－－－－－－－－－－－－－－－－－－－－分割线－－－－－－－－－－－－－－－－－－－－－

//CATransition
// 请自行导入框架和头文件。
- (void)viewDidAppear:(BOOL)animated
{

    
    
    NSMutableArray * arr =[[NSMutableArrayalloc]initWithObjects:@"2.jpg",@"1.jpg",@"4.jpg",@"3.jpg" ,nil];
    int k = [arr count];  
    while(--k > 0) {  
        int j = rand()%(k+1);  
        [arr exchangeObjectAtIndex:k withObjectAtIndex:j];
    }
    
    
    float offset = 10;
    int cellPadingY=10;
    for (int i = 0; i < [arr count]; i++) 
    {
        CGRect rect = CGRectMake(offset, cellPadingY, 90, 90);
        button = [[UIButton alloc]initWithFrame:rect];
        [buttonsetTitle:[[NSStringalloc]initWithFormat:@"btn%i",i] forState:UIControlStateNormal];
        [buttonsetTitleColor:[UIColorredColor] forState:UIControlStateNormal];
        [buttonaddTarget:selfaction:@selector(buttonOnClick:) forControlEvents:UIControlEventTouchUpInside];
        //button.backgroundColor = [UIColor clearColor];
        [buttonsetBackgroundImage:[UIImageimageNamed:[arr objectAtIndex:i] ]forState:UIControlStateNormal];//设置图片，取数组的第i张图片 [array objectAtIndex:i];
        
        //为后面按钮的视图控制器做准备。。。。
        NSString *objName=[[NSString alloc]initWithFormat:@"%@",[arr objectAtIndex:i]];
        int tagValue=0;
        if([objName isEqualToString:@"1.jpg"]){tagValue=1;};
        if([objName isEqualToString:@"2.jpg"]){tagValue=2;};
        if([objName isEqualToString:@"3.jpg"]){tagValue=3;};
        if([objName isEqualToString:@"4.jpg"]){tagValue=4;};
        button.tag = tagValue + 100; //加上100 以免跟其它tag一样 
        [self.view  addSubview:button];
        
        //.................................................................
        offset += 90 + 15;
        if(offset>320){
            offset=10;
            cellPadingY+=100;
        }
        
        
        
    }
    CATransition *transition = [CATransitionanimation];
    transition.duration = 3;
    transition.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseOut];
    transition.type = kCATransitionFade;
    transition.delegate = self;
    [self.view.layer  addAnimation:transition forKey:nil];
    
    [super viewDidAppear:animated];
}