苦逼的开发者,最终败给了一个任性的UI,系统原生UIAlertController的按纽颜色必须改.于是,开始了不归路.
之前的版本是自己用view写的一个仿系统UIActionSheet,动画感觉都挺好,就是毛玻璃背景没有系统的好,由于最低兼容了ios8,所以就抛弃了UIActionSheet,改用UIAlertController.
做法其实很简单,采用runtime机制.对于runtime不了解的,我想还是别看各种介绍文章了,找一个简单的demo多写几遍,就行了.
做法很简单,自己写一个类 继承自UIAlertController,还是先把.h和.m的代码都给大家吧.
SCAlertController.h
//
// SCAlertController.h
// SCAlertController
//
// Created by it3部01 on 16/8/3.
// Copyright ? 2016年 benben. All rights reserved.
// #import @interface SCAlertAction : UIAlertAction @property (nonatomic,strong) UIColor *textColor; /**< 按钮title字体颜色 */ @end @interface SCAlertController : UIAlertController @property (nonatomic,strong) UIColor *tintColor; /**< 统一按钮样式 不写系统默认的蓝色 */
@property (nonatomic,strong) UIColor *titleColor; /**< 标题的颜色 */
@property (nonatomic,strong) UIColor *messageColor; /**< 信息的颜色 */ @end
SCAlertController.m
//
// SCAlertController.m
// SCAlertController
//
// Created by it3部01 on 16/8/3.
// Copyright ? 2016年 benben. All rights reserved.
// #import "SCAlertController.h"
#import @implementation SCAlertAction //按钮标题的字体颜色
-(void)setTextColor:(UIColor *)textColor
{
_textColor = textColor; unsigned int count = 0;
Ivar *ivars = class_copyIvarList([UIAlertAction class], &count);
for(int i =0;i < count;i ++){ Ivar ivar = ivars[i];
NSString *ivarName = [NSString stringWithCString:ivar_getName(ivar) encoding:NSUTF8StringEncoding]; if ([ivarName isEqualToString:@"_titleTextColor"]) { [self setValue:textColor forKey:@"titleTextColor"];
}
}
} @end @implementation SCAlertController -(void)viewDidLoad
{
[super viewDidLoad]; unsigned int count = 0;
Ivar *ivars = class_copyIvarList([UIAlertController class], &count);
for(int i = 0;i < count;i ++){ Ivar ivar = ivars[i];
NSString *ivarName = [NSString stringWithCString:ivar_getName(ivar) encoding:NSUTF8StringEncoding]; //标题颜色
if ([ivarName isEqualToString:@"_attributedTitle"] && self.title && self.titleColor) { NSMutableAttributedString *attr = [[NSMutableAttributedString alloc]initWithString:self.title attributes:@{NSForegroundColorAttributeName:self.titleColor,NSFontAttributeName:[UIFont boldSystemFontOfSize:14.0]}];
[self setValue:attr forKey:@"attributedTitle"];
} //描述颜色
if ([ivarName isEqualToString:@"_attributedMessage"] && self.message && self.messageColor) { NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:self.message attributes:@{NSForegroundColorAttributeName:self.messageColor,NSFontAttributeName:[UIFont systemFontOfSize:14.0]}];
[self setValue:attr forKey:@"attributedMessage"];
}
} //按钮统一颜色
if (self.tintColor) {
for (SCAlertAction *action in self.actions) {
if (!action.textColor) {
action.textColor = self.tintColor;
}
}
}
} @end
一般来说对于SCAlertController里面的属性应该像SCAlertAction一样放在setter方法里面修改,这里我表示为了方便就放在这个方法里面了.
-(void)viewDidLoad
{
[super viewDidLoad];
}
用法就很简单了,和系统原生UIAlertController一样,只是把UI换成SC,当然你可以改成自己喜欢的,但是别忘了改完.
SCAlertController *alertController = [SCAlertController alertControllerWithTitle:@"你确定要退出吗?" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
alertController.tintColor = [UIColor redColor]; //这里统一设置各个按钮的颜色都为红色.
当然,你还可以自定义某一个按钮的颜色.比如下面的取消按钮
alertController.titleColor = [UIColor redColor]; //取消
SCAlertAction *cancelAction = [SCAlertAction actionWithTitle:@"我不想退出" style:UIAlertActionStyleCancel handler:nil]; //单独修改一个按钮的颜色
cancelAction.textColor = [UIColor greenColor];
[alertController addAction:cancelAction]; //退出
SCAlertAction *exitAction = [SCAlertAction actionWithTitle:@"退出" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { }];
[alertController addAction:exitAction]; [self presentViewController:alertController animated:YES completion:nil];
}