https://www.jianshu.com/p/51949eec2e9c
2016.03.23 22:36* 字数 272 阅读 37401评论 54喜欢 72
在开发中,弹出框是必不可少的,通常情况下,我们只要弹出系统自带的弹出框就可以。but,在某些情况下,万恶的UI会要求你修改显示文字的大小、颜色,虽然系统自带有一种红色字体的UIAlertAction,但是这种Action并不能放在Cancel位置,所以,更多时候,需要我们自己修改文字字体和颜色。
我采用的方法是KVC:
正常情况下,我们配置出来的UIAlertController是这样的:
123.png
或者是这样:
345.png
代码如下:
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"提示内容" preferredStyle:UIAlertControllerStyleAlert];
// UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"提示内容" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:@"Default" style:UIAlertActionStyleDefault handler:nil];
UIAlertAction *destructiveAction = [UIAlertAction actionWithTitle:@"Destructive" style:UIAlertActionStyleDestructive handler:nil];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
[alertController addAction:defaultAction];
[alertController addAction:destructiveAction];
[alertController addAction:cancelAction];
[self presentViewController:alertController animated:YES completion:nil];
代码里展示了系统提供的三种UIAlertAction,现在我们要对文字的字体和颜色进行设置:
- 1.标题和提示内容的文字设置
代码如下:
//修改title
NSMutableAttributedString *alertControllerStr = [[NSMutableAttributedString alloc] initWithString:@"提示"];
[alertControllerStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 2)];
[alertControllerStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:NSMakeRange(0, 2)];
[alertController setValue:alertControllerStr forKey:@"attributedTitle"];
//修改message
NSMutableAttributedString *alertControllerMessageStr = [[NSMutableAttributedString alloc] initWithString:@"提示内容"];
[alertControllerMessageStr addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(0, 4)];
[alertControllerMessageStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:NSMakeRange(0, 4)];
[alertController setValue:alertControllerMessageStr forKey:@"attributedMessage"];
效果如下:
123.png
- 2.设置按钮文字,就拿取消按钮距离:
代码如下:
//修改按钮
if (cancelAction valueForKey:@"titleTextColor") {
[cancelAction setValue:[UIColor redColor] forKey:@"titleTextColor"];
}
效果如下:
123.png
至于里面的key值怎么得到的,过两天会写一篇文章来讲述。
经常需要设置message左对齐、段间距这些属性
- (IBAction)tapAlertControllerButton:(id)sender {
NSString *titleString = @"商家发货规则";
NSString *messageString = @"1、买家下单付款后,请尽快发货;\n2、买家下单付款后,若超过最迟发货的时间,商家仍未发货,那么后台将自动取消订单;\n3、若遇到物流高峰期,比如春节,双十一等,请点击【延迟发货】来延长最迟发货时间;\n4、每个订单只允许【延迟发货】一次,每次可延迟5天;";
NSString *alertTitle = @"知道了";
UIAlertController *_alertController = [UIAlertController alertControllerWithTitle:titleString message:messageString preferredStyle:UIAlertControllerStyleAlert];
[_alertController addAction:[UIAlertAction actionWithTitle:alertTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}]];
/* 修改title */
NSMutableAttributedString *attTitleString = [[NSMutableAttributedString alloc] initWithString:titleString];
[_alertController setValue:attTitleString forKey:@"attributedTitle"];
/* 修改message */
NSMutableAttributedString *attMsgString = [[NSMutableAttributedString alloc] initWithString:messageString];
// 设置字体
[attMsgString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, attMsgString.length)];
// 设置颜色
[attMsgString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, 10)];
NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
// 设置行间距
[paragraph setLineSpacing:3];
// 设置段间距
[paragraph setParagraphSpacingBefore:5];
// 设置对齐方式
[paragraph setAlignment:NSTextAlignmentLeft];
// 设置书写方向
[paragraph setBaseWritingDirection:NSWritingDirectionLeftToRight];
[attMsgString addAttribute:NSParagraphStyleAttributeName value:paragraph range:NSMakeRange(0, attMsgString.length)];
[_alertController setValue:attMsgString forKey:@"attributedMessage"];
/* 修改按钮的颜色 */
NSArray *actionArr = [_alertController actions];
[actionArr.firstObject setTitle:alertTitle];
[actionArr.firstObject setValue:[UIColor orangeColor] forKey:@"titleTextColor"];
[self presentViewController:_alertController animated:YES completion:nil];
}
示意图:
系统默认样式:
改变属性样式:
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作者:枫志应明
来源:CSDN
原文:https://blog.csdn.net/wsyx768/article/details/60874420
版权声明:本文为博主原创文章,转载请附上博文链接!
原文地址:https://www.cnblogs.com/sundaysgarden/p/10309352.html