iphone – networkActivityIndi​​catorVisible

概述此代码与networkActivityIndi​​catorVisible一起使用是否正确？ - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; UIApplication* app2 = [UIApplication sharedApplication]; app2.net 此代码与networkActivityIndi​​catorVisible一起使用是否正确？

- (voID)vIEwWillAppear:(BOol)animated {    [super vIEwWillAppear:animated];    UIApplication* app2 = [UIApplication sharedApplication];     app2.networkActivityIndicatorVisible = YES;     [self loadSources];  // Loads data in table vIEw    app2.networkActivityIndicatorVisible = NO; }

张志贤

解决方法 由于NetworkActivityIndi​​catorVisible可以在连接仍处于活动状态时从多个点设置,因此您需要跟踪启用/禁用它的调用数.以下UIApplication类别仅使用静态变量：

// file UIApplication+NetworkActivity.h@interface UIApplication (NetworkActivity)- (voID)showNetworkActivityIndicator;- (voID)hIDeNetworkActivityIndicator;@end// file UIApplication+NetworkActivity.m#import "UIApplication+NetworkActivity.h"static NSInteger activityCount = 0;@implementation UIApplication (NetworkActivity)- (voID)showNetworkActivityIndicator {    if ([[UIApplication sharedApplication] isstatusbarHIDden]) return;    @synchronized ([UIApplication sharedApplication]) {        if (activityCount == 0) {            [self setNetworkActivityIndicatorVisible:YES];        }        activityCount++;    }}- (voID)hIDeNetworkActivityIndicator {    if ([[UIApplication sharedApplication] isstatusbarHIDden]) return;    @synchronized ([UIApplication sharedApplication]) {        activityCount--;        if (activityCount <= 0) {            [self setNetworkActivityIndicatorVisible:NO];            activityCount=0;        }        }}@end

现在在您的客户端代码中导入UIApplication NetworkActivity.h并调用

// on connection started:[[UIApplication sharedApplication] showNetworkActivityIndicator];// on connection finished:[[UIApplication sharedApplication] hIDeNetworkActivityIndicator];

如果您担心指示灯只闪烁一秒钟,则不需要后台处理.只需调用[self performSelector：@selector(loadSources)withObject：Nil afterDelay：0.1],这样UI线程就有时间在阻塞主线程之前启动网络指示器动画.

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