iOS警示框自定义展示-优快云博客

本文介绍了一种在iOS应用中自定义展示警示框的方法，包括设置背景颜色、圆角、阴影等样式，并通过动画效果实现警示框的渐显渐隐。此方法允许开发者指定警示框出现的位置及持续时间。

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#define SCREEN_WIDTH  [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height

传入要显示的文字，警示框展示出现的高度，延时消失时间

+(void)showMessage:(NSString *)message andOriginY:(float)y andTime:(float)time
{
    UIWindow * window = [UIApplication sharedApplication].keyWindow;
    UIView *showview =  [[UIView alloc]init];
    showview.backgroundColor = [UIColor blackColor];
    showview.frame = CGRectMake(1, 1, 1, 1);
    showview.alpha = 1.0f;
    showview.layer.cornerRadius = 5.0f;
    showview.layer.masksToBounds = YES;
    [window addSubview:showview];
    
    UILabel *label = [[UILabel alloc]init];
    CGSize LabelSize = [message sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(290, 9000)];
    label.frame = CGRectMake(10, 5, LabelSize.width, LabelSize.height);
    label.text = message;
    label.textColor = [UIColor whiteColor];
    label.textAlignment = 1;
    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont boldSystemFontOfSize:15];
    [showview addSubview:label];
    showview.frame = CGRectMake((SCREEN_WIDTH - LabelSize.width - 20)/2, y, LabelSize.width+20, LabelSize.height+10);
    [UIView animateWithDuration:time animations:^{
        showview.alpha = 0;
    } completion:^(BOOL finished) {
        [showview removeFromSuperview];
    }];
}

自定义延时消失的警示框