话不多说,直接进主题
一、防止UIButton,cell等重复点击
主要是快速点击button或者cell,所对应的action或者逻辑会走多次,例如:点击button或者cell调用拨打电话的方法,会弹出拨打电话框好多次;这个对用户不太友好;问了下哥们儿,他给了个宏,目前算是解决这个问题;代码如下:
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// 防止多次调用
#define kPreventRepeatClickTime(_seconds_) \
static BOOL shouldPrevent; \
if (shouldPrevent) return ; \
shouldPrevent = YES; \
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)((_seconds_) * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ \
shouldPrevent = NO; \
}); \
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总的思路是设置一个bool变量,记录一下,延时更改下变量的值;使用:在所需要的button或者cell的action前调用即可:
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kPreventRepeatClickTime(0.5);
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二、获取当前视图最顶层的ViewController
获取当前视图最顶层的ViewController
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+ (UIViewController *)currentViewController {
UIWindow * window = [[UIApplication sharedApplication] keyWindow];
if (window.windowLevel != UIWindowLevelNormal){
NSArray *windows = [[UIApplication sharedApplication] windows];
for (UIWindow * tmpWin in windows){
if (tmpWin.windowLevel == UIWindowLevelNormal){
window = tmpWin;
break ;
}
}
}
UIViewController *currentVC = window.rootViewController;
while (currentVC.presentedViewController) {
currentVC = currentVC.presentedViewController;
}
if ([currentVC isKindOfClass:[UITabBarController class ]]) {
currentVC = [(UITabBarController *)currentVC selectedViewController];
}
if ([currentVC isKindOfClass:[UINavigationController class ]]) {
currentVC = [(UINavigationController *)currentVC topViewController];
}
return currentVC;
}
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三、代码截图相关
截取指定的View:
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/// 截屏
- ( void )actionForScreenShotWith:(UIView *)aimView savePhoto:( BOOL )savePhoto {
if (!aimView) return ;
UIGraphicsBeginImageContextWithOptions(aimView.bounds.size, NO, 0.0f);
[aimView.layer renderInContext: UIGraphicsGetCurrentContext()];
UIImage* viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
if (savePhoto) {
/// 保存到本地相册
UIImageWriteToSavedPhotosAlbum(viewImage, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
}
}
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保存图片的回调处理
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- ( void )image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:( void *)contextInfo{
if (error) {
NSLog(@ "保存失败,请重试" );
} else {
NSLog(@ "保存成功" );
}
}
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总结
以上就是这篇文章的全部内容了,本文还有许多不足,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。原文链接:http://my.csdn.net/syg90178aw