问题:

i am trying to customise all UITextField appearances for borderWith.

Trying something like this. Only first 2 lines are making a difference. Rest of the lines not working ?

[[UITextField appearance] setBackgroundColor:[UIColor greenColor]];
[[UITextField appearance] setTextColor:[UIColor blackColor]];
[UITextField appearance].layer.cornerRadius = 6.0f;
[UITextField appearance].layer.borderColor = [UIColor redColor].CGColor;
[UITextField appearance].layer.borderWidth = 3.f;

回答1:

Unfortunately the appearance proxy doesn't work on layers to do what you want you should subclass UITextField and do your customisations in the layoutSubviews method (or in the init)

回答2:

You can apply this to a class extended from UITextField or any UIControl you like to style.

1. Created an `extension` of `UITextField` and added following code:

- (void)awakeFromNib{

    self.layer.borderColor = [UIColor blueColor].CGColor;
    self.layer.borderWidth = 1.0f;
}

2.1 Create `UITextField` inside Code

Now if you create a UITextField inside your code, #import the extension of your UITextField and create the UITextField.

2.2 Create UITextField in `Interface Builder`

If you create the UIButton inside the Interface Builder, select the UITextField, go to the Identity Inspector and add the created extension as class for the UITextField.