ios - 如何创建一个循环以在每次按下按钮时指定不同的操作？

Question

我的 View Controller 中有一个名为“getQuoteButton”的方法，它是一个附加到按钮的 IBAction 方法，每次我点击按钮时，我都会得到一个随机引用。

我为每次展示新报价创建了一个特定的推送动画，我还想创建一个循环，每次我点击按钮时我都可以更改动画，但我不知道如何做。 .

这是我的代码(NOViewController)，它是一个单 View 应用程序:

 #import "NOViewController.h"
#include "NOQuotes.h"

@interface NOViewController ()

@end

@implementation NOViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.quotes = [[NOQuotes alloc] init];

    UIImage *background = [UIImage imageNamed:@"albert"];

    [self.backgroundImageView setImage:background];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (IBAction)getQuoteButton
{

    self.quotesLabel.text = [self.quotes getRandomQuote];

    CATransition *animationTran = [CATransition animation];
    [animationTran setType:kCATransitionPush];
    [animationTran setDuration:0.7f];
    [animationTran setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [self.quotesLabel.layer addAnimation:animationTran forKey:@"pushAnimation"];

}


@end

非常感谢任何帮助，如果您需要任何其他信息，请告诉我，以便您提供帮助:)

Answer 1

添加一个整数计数器变量，并在每次按下按钮时递增它。将代码添加到检查计数器的 getQuoteButton，并相应地设置动画类型和子类型:

@interface NOViewController () {
    int numClicks; // <<=== Added
}

@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.quotes = [[NOQuotes alloc] init];

    UIImage *background = [UIImage imageNamed:@"albert"];

    [self.backgroundImageView setImage:background];
    numClicks = 0; // <<=== Added
}

- (IBAction)getQuoteButton
{

    self.quotesLabel.text = [self.quotes getRandomQuote];

    CATransition *animationTran = [CATransition animation];
    switch (numClicks) { // <<=== Added
        case 0:
            [animationTran setType:kCATransitionPush];
            [animationTran setSubtype:kCATransitionFromRight];
            break;
        case 1:
            [animationTran setType:kCATransitionPush];
            [animationTran setSubtype:kCATransitionFromLeft];
            break;
        case 2:
            [animationTran setType:kCATransitionPush];
            [animationTran setSubtype:kCATransitionFromTop];
            break;
        ... // And so on;
        case 13:
            [animationTran setType:kCATransitionFade];
            // Fade has no subtype
            break;
    }
    numClicks = (numClick+1) % 13; // <<=== Added
    [animationTran setDuration:0.7f];
    [animationTran setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [self.quotesLabel.layer addAnimation:animationTran forKey:@"pushAnimation"];
}

您可以通过创建两个数组或一个类型/子类型对数组来缩短此代码，但是实现此目的需要在点击时递增成员变量的想法。