iOS获取变量属性：修改UIAlertController样式

iOS8 之后系统把UIActionSheet和UIAlertView合并为了UIAlertController,使用就不比多说了,但在使用的过程中发现样式是固定的&＃xff0c;点进去也未发现可以提供更改多样式的属性&＃xff0c;所以只能使用KVC在运行时动态访问和修改对象的属性。

但在使用过程中需要知道属性类型对应的key值,这里提供两个方法,是别人写好的&＃xff0c;借用一下。

//获得所有变量

- (NSArray *)getAllIvar:(id)object
{NSMutableArray *array &＃61; [NSMutableArray array];unsigned int count;Ivar *ivars &＃61; class_copyIvarList([object class], &count);for (int i &＃61; 0; i }

 
//获得所有属性

- (NSArray *)getAllProperty:(id)object
{NSMutableArray *array &＃61; [NSMutableArray array];unsigned int count;objc_property_t *propertys &＃61; class_copyPropertyList([object class], &count);for (int i &＃61; 0; i }

获取到属性之后就可以去设置样式了

经常需要设置message左对齐、段间距这些属性

- (IBAction)tapAlertControllerButton:(id)sender {NSString *titleString &＃61; &＃64;"商家发货规则";NSString *messageString &＃61; &＃64;"1、买家下单付款后&＃xff0c;请尽快发货&＃xff1b;\n2、买家下单付款后&＃xff0c;若超过最迟发货的时间&＃xff0c;商家仍未发货&＃xff0c;那么后台将自动取消订单&＃xff1b;\n3、若遇到物流高峰期&＃xff0c;比如春节&＃xff0c;双十一等&＃xff0c;请点击【延迟发货】来延长最迟发货时间&＃xff1b;\n4、每个订单只允许【延迟发货】一次&＃xff0c;每次可延迟5天&＃xff1b;";NSString *alertTitle &＃61; &＃64;"知道了";UIAlertController *_alertController &＃61; [UIAlertController alertControllerWithTitle:titleString message:messageString preferredStyle:UIAlertControllerStyleAlert];[_alertController addAction:[UIAlertAction actionWithTitle:alertTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {}]];/* 修改title */NSMutableAttributedString *attTitleString &＃61; [[NSMutableAttributedString alloc] initWithString:titleString];[_alertController setValue:attTitleString forKey:&＃64;"attributedTitle"];/* 修改message */NSMutableAttributedString *attMsgString &＃61; [[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 &＃61; [[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:&＃64;"attributedMessage"];/* 修改按钮的颜色 */NSArray *actionArr &＃61; [_alertController actions];[actionArr.firstObject setTitle:alertTitle];[actionArr.firstObject setValue:[UIColor orangeColor] forKey:&＃64;"titleTextColor"];[self presentViewController:_alertController animated:YES completion:nil];
}