更改UIButton标题而没有褪色效果？

Question

当我更改UIButton的标题时，它具有这种效果，即旧标题淡出，新标题淡入。是否可以在没有动画的情况下更改标题？

[self.a setTitle:@"a" forState:UIControlStateNormal];

Answer 1

对于系统UIButton ，使用：

[self.a layoutIfNeeded];

对于自定义UIButton ，使用：

[UIView setAnimationsEnabled:NO];
[self.a setTitle:@"a" forState:UIControlStateNormal];
[UIView setAnimationsEnabled:YES];

Answer 2

有两种方法可以做到这一点

1.系统按钮无动画

- (IBAction)actionChangeButtonTitle:(id)sender
{
  [UIView setAnimationsEnabled:NO];
  [buttonTitleChange setTitle:@"title" forState:UIControlStateNormal];
  [UIView setAnimationsEnabled:YES];
  [buttonTitleChange layoutIfNeeded]; //For System Buttons
}

2.自定义按钮不带动画

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn addTarget:self 
       action:@selector(actionChangeButtonTitle:)forControlEvents:UIControlEventTouchUpInside];
[btn setTitle:@"Change Title" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:btn];
- (IBAction)actionChangeButtonTitle:(id)sender
{
  [btn setTitle:@"title" forState:UIControlStateNormal];
}

谢谢-：）