UIView backgroundColor颜色循环 [英] UIView backgroundColor color cycle

问题描述

首先，我是新的这个Xcode / Objective-C的东西，所以去容易在我！ :)
我做了一个测试应用程序，通过按一些按钮，背景变化。我有一个红色，蓝色，绿色，白色，黑色和复活按钮。

First of all, I am new to this Xcode/Objective-C thing, so go easy on me! :) I made a test app that, by pressing some buttons, the background changes. I have a red, blue, green, white, black and revive button.

我通过按下所有的颜色按钮使应用程序改变backgrnd的颜色。但是，我想让应用程序循环通过颜色，说100倍非常快，当按下Revive按钮。由于某种原因，它不工作。

I made the app change the color of the backgrnd by pressing all the color buttons. However, I want to make the app cycle through the colors, say 100 times very fast when pressing the Revive button. For some reason, it doesnt work.

以下是无效的代码：

使用下面的代码，最后一个颜色。

Using the code below, only changes to the last color.

- (IBAction)Revive:(id)sender {

    for (int y=0; y < 100; y++) {
    view1.backgroundColor = [UIColor redColor];
    view1.backgroundColor = [UIColor greenColor];
    view1.backgroundColor = [UIColor blueColor];
    view1.backgroundColor = [UIColor whiteColor];
    view1.backgroundColor = [UIColor blackColor];
                                }  
}

使用下面的代码，从白色变为黑色

Using the code below, whitout the loop, the app fades from white to black

- (IBAction)Revive:(id)sender {

    [UIView animateWithDuration:0.2 animations:^{
    view1.backgroundColor = [UIColor redColor];
    view1.backgroundColor = [UIColor greenColor];
    view1.backgroundColor = [UIColor blueColor];
    view1.backgroundColor = [UIColor whiteColor];
    view1.backgroundColor = [UIColor blackColor];
    }];

 [UIView commitAnimations];

}

任何人都知道为什么会发生这种情况， ？

Anyone knows why this is happening and a solution to my problem?

推荐答案

这将有效：

- (void) doBackgroundColorAnimation {
    static NSInteger i = 0;
    NSArray *colors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor blueColor], [UIColor whiteColor], [UIColor blackColor], nil];

    if(i >= [colors count]) {
        i = 0;
    }

    [UIView animateWithDuration:2.0f animations:^{
        self.view.backgroundColor = [colors objectAtIndex:i];           
    } completion:^(BOOL finished) {
        ++i;
        [self doBackgroundColorAnimation];
    }]; 

}

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