UIActionSheet 字体颜色设置

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iOS8.0 UIActionSheet的字体的颜色设置

在我们app的开发过程经常会遇到各种弹框,提示框的需求,然而系统的自带的字体颜色是如此的ugly。那我们今天就讨论一下,在ios7.0和8.0上面如何修改弹框的的title的字体颜色。
  • 首先在iOS7.0修改UIActionSheet title的字体是很简单的,设置代理,在willPresentActionSheet方法中修改。代码如下:

    - (void)willPresentActionSheet:(UIActionSheet *)actionSheet {  for (UIView *subViwe in actionSheet.subviews) {      if ([subViwe isKindOfClass:[UILabel class]]) {          UILabel *label = (UILabel *)subViwe;          label.font = [UIFont systemFontOfSize:16];          label.frame = CGRectMake(CGRectGetMinX(label.frame), CGRectGetMinY(label.frame), CGRectGetWidth(label.frame), CGRectGetHeight(label.frame)+20);      }      if ([subViwe isKindOfClass:[UIButton class]]) {          UIButton *button = (UIButton*)subViwe;          if ([button.titleLabel.text isEqualToString:@"确定"]) {              [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];          } else {              [button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];          }          button.titleLabel.font = [UIFont systemFontOfSize:18];      }  }}

当然自从xcode在系统8.0采用了UIAlertController过后,7.0的方法就没有用了,那么在iOS8.0过后我们怎么修改title的字体颜色呢?在这里推荐一款很好用的第三方里脊串的MMPopupView 里面的控件我觉得还是很好用的!那我就不想用第三方,只想在系统方法上修改怎么办呢。很简单,下面贴上我的代码!也就几段代码,我就不上传我的github了。

  • iOS8.0 系统UIAlertController创建actionSheet的方法

      UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil message: nil preferredStyle:UIAlertControllerStyleActionSheet];  [alertController addAction: [UIAlertAction actionWithTitle: @"USD($)" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {}]];  [alertController addAction: [UIAlertAction actionWithTitle:@"RMB(¥)" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action){}]];  [alertController addAction: [UIAlertAction actionWithTitle: @"取消" style: UIAlertActionStyleCancel handler:nil]];  [self presentViewController: alertController animated: YES completion: nil];
  • 首先通过runtime获取对应的内部属性

    包含头文件#import <objc/runtime.h>  unsigned int count = 0;  Ivar *ivars = class_copyIvarList([UIAlertAction class], &count);  for (int i = 0; i<count; i++) {      // 取出成员变量//        Ivar ivar = *(ivars + i);      Ivar ivar = ivars[i];      // 打印成员变量名字      NSLog(@"%s------%s", ivar_getName(ivar),ivar_getTypeEncoding(ivar));  }
  • 获取到对应的属性我们就可以修改系统内部的默认值了

    // 取消按钮  -(void)addCancelActionTarget:(UIAlertController*)alertController title:(NSString *)title{  UIAlertAction *action = [UIAlertAction actionWithTitle:title style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {  }];  [action setValue:[UIColor purpleColor] forKey:@"_titleTextColor"];  [alertController addAction:action];}//添加对应的title    这个方法也可以传进一个数组的titles  我只传一个是为了方便实现每个title的对应的响应事件不同的需求不同的方法- (void)addActionTarget:(UIAlertController *)alertController title:(NSString *)title color:(UIColor *)color action:(void(^)(UIAlertAction *action))actionTarget{  UIAlertAction *action = [UIAlertAction actionWithTitle:title style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {      actionTarget(action);  }];  [action setValue:color forKey:@"_titleTextColor"];  [alertController addAction:action];}
  • 最后具体的实现代码就是这样的 大家可以复制代码自己去试试

     UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet]; [self addActionTarget:alert title:@"星期一" color: [UIColor redColor] action:^(UIAlertAction *action) {     NSLog(@"nicaicai"); }]; [self addActionTarget:alert title:@"星期二" color: [UIColor redColor] action:^(UIAlertAction *action) {     NSLog(@"nicaicai"); }]; [self addActionTarget:alert title:@"星期三" color: [UIColor redColor] action:^(UIAlertAction *action) {     NSLog(@"nicaicai"); }]; [self addActionTarget:alert title:@"星期四" color: [UIColor redColor] action:^(UIAlertAction *action) {     NSLog(@"nicaicai"); }]; [self addCancelActionTarget:alert title:@"取消"]; [self presentViewController:alert animated:YES completion:nil];

    实现效果如下

原:http://www.jianshu.com/p/1c052c761a15

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