UIAlertController
2016-08-07 本文已影响25人
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- 通过runtime 修改AlertController的字体颜色 原文链接
自定义类 .h 文件
#import <UIKit/UIKit.h>
@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
@property (nonatomic,strong) UIColor *titleColor; // 标题的颜色
@property (nonatomic,strong) UIColor *messageColor; //信息的颜色
@end
自定义类 .m 文件
#import "SCAlertController.h"
#import <objc/runtime.h>
@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"];
}
}
//按钮如果没设颜色,则统一用tintColor
if (self.tintColor) {
for (SCAlertAction *action in self.actions) {
if (!action.textColor) {
action.textColor = self.tintColor;
}
}
}
}
@end
用法和父类的用法一致
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.
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:nil];
[alertController addAction:exitAction];
[self presentViewController:alertController animated:YES completion:nil];
- 对UIAlertController 可以做一个封装
+(void)alertShowTitle:(NSString*)title
message:(NSString*)message
sureText:(NSString*)sureText
sureBlock:(void(^)())sureBlock
cancelText:(NSString*)cancelText
cancelBlock:(void(^)())cancelBlock
alertVCsender:(UIViewController*)sender{
if (!sender) {
sender = [UIApplication sharedApplication].keyWindow.rootViewController;
}
UIAlertController *alertController =[UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:sureText style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (sureBlock) {
sureBlock();
}
}];
[alertController addAction:sureAction];
UIAlertAction *cancelAction = nil;
if (cancelText.length > 0) {
cancelAction = [UIAlertAction actionWithTitle:cancelText style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (cancelBlock) {
cancelBlock();
}
}];
[alertController addAction:cancelAction];
}
[sender presentViewController:alertController animated:YES completion:nil];
}