使用外观向 uitextfield 添加填充

Question

我不想为了获得文本填充而继承 UITextField 类。

我想使用外观代理。

我试过这个：

UIView *padding = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 5, 2)];
[[UITextField appearance] setLeftView:padding];
[[UITextField appearance] setLeftViewMode:UITextFieldViewModeAlways];

不幸的是，如果我将此代码放在我的应用程序委托中，任何包含 uitextfield 的视图控制器都无法加载视图

如何在不对文本字段进行子类化的情况下添加填充？

Answer 1

Can you try these..

- (CGRect)textRectForBounds:(CGRect)bounds {
    int margin = 10;
    CGRect inset = CGRectMake(bounds.origin.x + bounds.size.width/2, bounds.origin.y, bounds.size.width/2 - margin, bounds.size.height);
    return inset;
}

- (CGRect)editingRectForBounds:(CGRect)bounds {
    int margin = 10;
    CGRect inset = CGRectMake(bounds.origin.x + bounds.size.width/2, bounds.origin.y, bounds.size.width/2 - margin, bounds.size.height);
    return inset;
}

（或）

这样做

// Do any additional setup after loading the view from its nib.

 UIView *paddingTxtfieldView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 20, 42)];// what ever you want 
 txtfield.leftView = paddingTxtfieldView;
 txtfield.leftViewMode = UITextFieldViewModeAlways;
 txtfield.returnKeyType = UIReturnKeyNext;// if you want to go next textfiled write this otherwise "UIReturnKeyDone"