UIActivityIndi​​catorView正确用法 [英] UIActivityIndicatorView proper usage

问题描述

我的问题是关于在iPhone项目中使用活动指示器的问题.我有一个包含UIActivityIndi​​catorView

My question regards the use of activity indicator in an iPhone project. I have a class that contains an UIActivityIndicatorView

@interface StatusView : UIView 
{
    UIActivityIndicatorView *indicator;
    UILabel *textLabel;

}

- (id)initWithFrame:(CGRect)frame Text:(NSString*)text andShowIndicator:(BOOL)value;

在我的业务逻辑代码中，我调用[indicator startAnimating]，并且该框架出现在屏幕底部.该代码还包含一个释放指标的dealloc方法

In my business logic code I call [indicator startAnimating] and the frame appears at the bottom of the screen. The code also contains a dealloc method that releases the indicator

- (void)dealloc 
{
    [indicator release];

    [super dealloc];
}

大多数情况下，指标运行良好，但是在某些情况下永远不会消失.

Most of the time the indicator works well, however there are a few occasions that never disappears.

我是否总是需要显式调用stopAnimating方法?发行版可以处理吗?正确的用法是什么?

Do I always need to explicitly call the stopAnimating method? Does the release handle it? What is the proper usage?

推荐答案

stopAnimating:方法停止 UIActivityIndi​​catorView 和 release 的释放object.
在Objective-C中，每个对象都有一个内部计数器，该计数器用于跟踪对象或对象使用的所有引用. [对象保留] 将计数器加1，而 [object release] 将计数器减1.当计数器达到零时，将调用dealloc. release 是关于内存管理的，而 stopAnimating:是 UIActivityIndi​​catorView 的功能.因此，如果您想停止对 UIActivityIndi​​catorView 进行动画处理，则必须调用 stopAnimating:方法.在 ARC 中，不必执行 release ，因此最好使用 ARC .

stopAnimating: method stops the wheel of UIActivityIndicatorView and release release the object.
In Objective-C each object has an internal counter that is used to keep track of all references used by the objects or object has. [object retain] increments the counter by 1 and [object release] decrements the counter by 1. When counter reaches to zero, dealloc is then called. release is about memory management while stopAnimating: is a functionality of UIActivityIndicatorView. So if you want to stop animating your UIActivityIndicatorView you would have to call stopAnimating: method. In ARC dont have to do release so better to use ARC.

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