脑袋显示提示,如tableview滑动提示滑回顶部

头部显示提示,如tableview滑动提示滑回顶部

by 伍雪颖

就是在[[[UIApplication sharedApplication] delegate] window]添加要的内容:

#import "TipsBar.h"

@implementation TipsBar

UILabel *tipsLabel;
int width;
+ (void)showInView:(UIView *)view {
    width = view.frame.size.width;
    if (tipsLabel == nil) {
        tipsLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, -20, view.frame.size.width, 20)];
        tipsLabel.backgroundColor = [UIColor blackColor];
        tipsLabel.textColor = [UIColor whiteColor];
        tipsLabel.text = @"点击返回顶部";
        tipsLabel.font = [UIFont systemFontOfSize:12];
        tipsLabel.textAlignment = NSTextAlignmentCenter;
    }
    if ([[[UIApplication sharedApplication] delegate] window] != nil) {
        [[[[UIApplication sharedApplication] delegate] window] addSubview:tipsLabel];
        [[[[UIApplication sharedApplication] delegate] window] setWindowLevel:UIWindowLevelStatusBar];
    }
    [UIView animateWithDuration:0.3 animations:^{
        tipsLabel.frame = CGRectMake(0, 0, view.frame.size.width, 20);
    }];
}

+ (void)hide {
    [UIView animateWithDuration:0.3 animations:^{
        tipsLabel.frame = CGRectMake(0, -20, width, 20);
    } completion:^(BOOL finished) {
        [tipsLabel removeFromSuperview];
        tipsLabel = nil;
    }];
}

@end

脑袋显示提示,如tableview滑动提示滑回顶部

头部显示提示,如tableview滑动提示滑回顶部

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