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