懒人代码－简化ActivityIndicatorView的创建和使用代码

最新推荐文章于 2025-03-02 17:59:27 发布

转载最新推荐文章于 2025-03-02 17:59:27 发布 · 431 阅读

文章标签：

#uiview #interface #class

本文介绍了一种简单的方法，只需四个方法即可实现在iOS应用中ActivityView的居中显示。通过定义UIView的扩展，提供了创建、获取、显示和隐藏居中ActivityView的功能。

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分享一下我自己的懒人代码吧，只要四个方法（最少只要show和hide两个也行），就可以实现ActivitiyView的居中显示

代码很简单，自己看下了

#define activityViewTag                0x98751234

@interface UIView (UIViewUtils)

- (void)showActivityViewAtCenter;
- (void)hideActivityViewAtCenter;
- (UIActivityIndicatorView*)createActivityViewAtCenter:(UIActivityIndicatorViewStyle)style;
- (UIActivityIndicatorView*)getActivityViewAtCenter;

@end

#import "UIViewUtils.h"

@implementation UIView (UIViewUtils)

- (UIActivityIndicatorView*)createActivityViewAtCenter:(UIActivityIndicatorViewStyle)style
{
    static int size = 30;

    UIActivityIndicatorView* activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:style];
    activityView.frame = CGRectMake([UIScreen mainScreen].bounds.size.width/2 - size/2, [UIScreen mainScreen].bounds.size.height/2 - size*2, size, size);
    activityView.tag = activityViewTag;
    [self addSubview:activityView];
    [activityView release];

    return activityView;
}

- (UIActivityIndicatorView*)getActivityViewAtCenter
{
    UIView* view = [self viewWithTag:activityViewTag];
    if (view != nil && [view isKindOfClass:[UIActivityIndicatorView class]]){
        return (UIActivityIndicatorView*)view;
    }
    else {
        return nil;
    }
}

- (void)showActivityViewAtCenter
{
    UIActivityIndicatorView* activityView = [self getActivityViewAtCenter];
    if (activityView == nil){
        activityView = [self createActivityViewAtCenter:UIActivityIndicatorViewStyleWhite];
    }

    [activityView startAnimating];
}

- (void)hideActivityViewAtCenter
{
    UIActivityIndicatorView* activityView = [self getActivityViewAtCenter];
    if (activityView != nil){
        [activityView stopAnimating];
    }
}

@end