欢迎加入 iOS开发QQ群:151133690
本篇内容是对<a href ="http://www.jianshu.com/p/cecd1b4bbf27" > UIAlertController 简单修改title以及按钮的字体颜色 </a>的加强版,对系统UIAlertController类添加Category使用更加简单,同时添加block回调方法
/**
根据otherActionTitles数组创建UIAlertController
@param title title
@param message message
@param cancelActionTitle 取消Action标题
@param otherActionTitles 其他Action标题
@param handle 点击回调 -1 取消Action点击 0~n 其他Action点击
@return UIAlertController
*/
+(instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message cancelActionTitle:(NSString *)cancelActionTitle otherActionTitles:(NSArray<NSString *> *)otherActionTitles handle:(void (^)(NSInteger index))handle;
先来看看效果示例
修改按钮颜色.PNG
修改标题颜色.PNG
修改按钮和标题的颜色.PNG
做法很简单,自己写UIAlertController的Category 别忘了导入头文件,然后复制如下代码到.h 和.m即可.
UIAlertController+Color.h
//
// UIAlertController+Color.h
// UIAlertControllerColor
//
// Created by benben on 16/12/15.
// Copyright © 2016年 benben. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIAlertController (Color)
@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 */
/**
根据otherActionTitles数组创建UIAlertController
@param title title
@param message message
@param cancelActionTitle 取消Action标题
@param otherActionTitles 其他Action标题
@param handle 点击回调 -1 取消Action点击 0~n 其他Action点击
@return UIAlertController
*/
+(instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message cancelActionTitle:(NSString *)cancelActionTitle otherActionTitles:(NSArray<NSString *> *)otherActionTitles handle:(void (^)(NSInteger index))handle;
@end
@interface UIAlertAction (Color)
@property (nonatomic,strong) UIColor *textColor; /**< 按钮title字体颜色 */
@end
UIAlertController+Color.m
//
// UIAlertController+Color.h
// UIAlertControllerColor
//
// Created by benben on 16/12/15.
// Copyright © 2016年 benben. All rights reserved.
//
#import "UIAlertController+Color.h"
#import <objc/runtime.h>
@implementation UIAlertController (Color)
/**
根据otherActionTitles数组创建UIAlertController
@param title title
@param message message
@param cancelActionTitle 取消Action标题
@param otherActionTitles 其他Action标题
@param handle 点击回调 -1 取消Action点击 0~n 其他Action点击
@return UIAlertController
*/
+(instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message cancelActionTitle:(NSString *)cancelActionTitle otherActionTitles:(NSArray<NSString *> *)otherActionTitles handle:(void (^)(NSInteger))handle
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];
//如果有取消按钮
if (cancelActionTitle) {
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelActionTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
if (handle) {
handle(-1);
}
}];
[alertController addAction:cancelAction];
}
if (otherActionTitles.count > 0) {
[otherActionTitles enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
UIAlertAction *otherAction = [UIAlertAction actionWithTitle:obj style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (handle) {
handle(idx);
}
}];
[alertController addAction:otherAction];
}];
}
return alertController;
}
-(void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
//按钮统一颜色
if (self.tintColor) {
for (UIAlertAction *action in self.actions) {
if (!action.textColor || action.style != UIAlertActionStyleDestructive) {
action.textColor = self.tintColor;
}
}
}
}
-(UIColor *)tintColor
{
return objc_getAssociatedObject(self, @selector(tintColor));
}
-(void)setTintColor:(UIColor *)tintColor
{
objc_setAssociatedObject(self, @selector(tintColor), tintColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(UIColor *)titleColor
{
return objc_getAssociatedObject(self, @selector(titleColor));
}
-(void)setTitleColor:(UIColor *)titleColor
{
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 && titleColor) {
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc]initWithString:self.title attributes:@{NSForegroundColorAttributeName:titleColor,NSFontAttributeName:[UIFont boldSystemFontOfSize:14.0]}];
[self setValue:attr forKey:@"attributedTitle"];
}
}
free(ivars);
objc_setAssociatedObject(self, @selector(titleColor), titleColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(UIColor *)messageColor
{
return objc_getAssociatedObject(self, @selector(messageColor));
}
-(void)setMessageColor:(UIColor *)messageColor
{
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];
//描述颜色
if ([ivarName isEqualToString:@"_attributedMessage"] && self.message && messageColor) {
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:self.message attributes:@{NSForegroundColorAttributeName:messageColor,NSFontAttributeName:[UIFont systemFontOfSize:14.0]}];
[self setValue:attr forKey:@"attributedMessage"];
}
}
free(ivars);
objc_setAssociatedObject(self, @selector(messageColor), messageColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
@implementation UIAlertAction (Color)
-(UIColor *)textColor
{
return objc_getAssociatedObject(self, @selector(textColor));
}
//按钮标题的字体颜色
-(void)setTextColor:(UIColor *)textColor
{
if (self.style == UIAlertActionStyleDestructive) {
return;
}
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"];
}
}
free(ivars);
objc_setAssociatedObject(self, @selector(textColor), textColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
用法就很简单了,和系统原生UIAlertController一样
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"你确定退出吗" message:@"真的要退出吗?" preferredStyle:UIAlertControllerStyleActionSheet];
alertController.titleColor = [UIColor redColor];//修改title的颜色
alertController.messageColor = [UIColor yellowColor]; //修改message的颜色
alertController.tintColor = [UIColor redColor]; //全局修改Action的颜色 -- 当然你也可以单独修改某一个Action的颜色 看下面👇
//添加返回按钮
UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"我不想退出" style:UIAlertActionStyleCancel handler:nil];
[alertController addAction:cancel];
cancel.textColor = [UIColor redColor]; //单个修改Action的颜色
//添加确定退出按钮
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"退出" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:alertAction];
[self presentViewController:alertController animated:YES completion:nil];
如果你比较懒 那么我推荐你这么使用
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"我是标题" message:@"我是message" cancelActionTitle:@"我是取消按钮" otherActionTitles:@[@"title1",@"title2",@"title3"] handle:^(NSInteger index) {
//Action点击回调
//注意 cancelAction index 为 -1,
// otherAction index为 otherActionTitles数组下标
}];
alertController.titleColor = [UIColor redColor];//修改title的颜色
alertController.messageColor = [UIColor yellowColor]; //修改message的颜色
alertController.tintColor = [UIColor redColor]; //全局修改Action的颜色
//注意 该方法 不能单独设置 某一个Action的颜色 只能修改全部
alertController.tintColor = [UIColor redColor];
[self presentViewController:alertController animated:YES completion:nil];
好了 ,就这些了...
