苹果开发 笔记（25）CATransition

今天继续练习动画方面，了解一下CATransition 方面用法。不知道大家有没有发现学ios的时候，有一个很怪现象，在学一段时间很容易忘记了自己写过的东西，过一段时间后又会把前几个星期写的程序都忘记了。这种有点像你吞了一个物体，它在反抗你。

这个练习就是试每一个CATransition的效果是怎样的，顺便看一下UIPickerView 是怎么一回事。他的代理方式类似 TableView，这个代理模式用到场景太多了，有时候多少会觉得罗嗦一点。写熟悉了也没所谓了。

切换后，这个程序就可以看到每一个效果情况了。唯一个kCATransitionFade 这个情况不知道发生什么事，没看到什么效果存在。
UIKit 组件众多，每一个尝试一下都要花一点时间。虽然社区和文档都很成熟，很多有价值的blog 都有相应的解答。这些资源相当宝贵。 有时候还是需要尝试一下断网开发才行，至少这样才可以训练一下找文档的能力。现在每次百度找答案有时候有时候觉得自己开始会变笨了。尽管找问题能力很棒，解决问题就弱化了。

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIPickerViewDataSource,UIPickerViewDelegate>
//创建一个选择器
@property (nonatomic,strong) UIPickerView *pickerView;
@end

#import "ViewController.h"

@interface ViewController ()
{

    NSArray *pickerArray;
    NSArray *typeArray;
    UIImageView *imageView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    pickerArray = @[@"kCATransitionFade",
                    @"pageCurl",
                    @"pageUnCurl",
                    @"rippleEffect",
                    @"suckEffect",
                    @"cube",
                    @"oglFlip",
                    @"MoveIn+kCATransitionFromRight",
                    @"MoveIn+kCATransitionFromLeft",
                    @"MoveIn+kCATransitionFromTop",
                    @"MoveIn+kCATransitionFromBottom",

                    @"Push+kCATransitionFromRight",
                    @"Push+kCATransitionFromLeft",
                    @"Push+kCATransitionFromTop",
                    @"Push+kCATransitionFromBottom",

                    @"Reveal+kCATransitionFromRight",
                    @"Reveal+kCATransitionFromLeft",
                    @"Reveal+kCATransitionFromTop",
                    @"Reveal+kCATransitionFromBottom"
                    ];

// pageCurl 向上翻一页
// pageUnCurl 向下翻一页
// rippleEffect 滴水效果
// suckEffect 收缩效果，如一块布被抽走
// cube 立方体效果
// oglFlip 上下翻转效果

    typeArray = @[ @[kCATransitionFade],
                   @[@"pageCurl"],
                   @[@"pageUnCurl"],
                   @[@"rippleEffect"],
                   @[@"suckEffect"],
                   @[@"cube"],
                   @[@"oglFlip"],
                   @[kCATransitionMoveIn,kCATransitionFromRight],
                   @[kCATransitionMoveIn,kCATransitionFromLeft],
                   @[kCATransitionMoveIn,kCATransitionFromTop],
                   @[kCATransitionMoveIn,kCATransitionFromBottom],

                   @[kCATransitionPush,kCATransitionFromRight],
                   @[kCATransitionPush,kCATransitionFromLeft],
                   @[kCATransitionPush,kCATransitionFromTop],
                   @[kCATransitionPush,kCATransitionFromBottom],

                   @[kCATransitionReveal,kCATransitionFromRight],
                   @[kCATransitionReveal,kCATransitionFromLeft],
                   @[kCATransitionReveal,kCATransitionFromTop],
                   @[kCATransitionReveal,kCATransitionFromBottom]
                   ];


    imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"bbg.jpg"]];
    [self.view addSubview:imageView];

    //选择器
    self.pickerView =[[UIPickerView alloc]init];
    [self.view addSubview:self.pickerView];
    self.pickerView.frame =(CGRect){0,self.view.frame.size.height-180+20,320,180};
    self.pickerView.delegate = self;
    self.pickerView.dataSource = self;
    self.pickerView.backgroundColor = [UIColor orangeColor];


}


// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [pickerArray count];
}

-(NSString *) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

    return [pickerArray objectAtIndex:row];
}


- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{

    NSArray *typeTempArray =typeArray[row];

    CATransition *transaction =[CATransition animation] ;
    if ([typeTempArray count] ==1)
    {
        transaction.type = typeTempArray[0] ;
        transaction.duration = 1;
    }
    else
    {
        transaction.type = typeTempArray[0];
        transaction.subtype = typeTempArray[1];
        transaction.duration = 1;
    }

    [imageView.layer addAnimation:transaction forKey:nil];

}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end