如果你只需要左边空白，你可以试试这个:

UItextField *textField = [[UITextField alloc] initWithFrame:...];
UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, textField.frame.size.height)];
leftView.backgroundColor = textField.backgroundColor;
textField.leftView = leftView;
textField.leftViewMode = UITextFieldViewModeAlways;

这对我很管用。我希望这能有所帮助。

如果你想改变TOP和LEFT缩进只有这样

//占位符

- (CGRect)textRectForBounds:(CGRect)bounds {

CGRect frame = bounds;
frame.origin.y = 3;
 frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}

//文本位置

- (CGRect)editingRectForBounds:(CGRect)bounds {

CGRect frame = bounds;
frame.origin.y = 3;
 frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}

我通常尽量避免子类化，但如果你已经:

// add a property 
@property (nonatomic) UIEdgeInsets edgeInsets;

// and override:

- (CGRect)textRectForBounds:(CGRect)bounds
{
    return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}

- (CGRect)editingRectForBounds:(CGRect)bounds
{
    return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}

如果你有一个明确的按钮，接受的答案将不适合你。我们还应该警惕苹果在未来通过调用super来改变事情。

因此，为了确保文本不会与清除按钮重叠，让我们先从super中获取“默认”值，然后根据需要进行调整。

这段代码将在文本框的顶部、左侧和底部添加一个10px的insets:

@interface InsetTextField : UITextField

@end


@implementation InsetTextField

// Placeholder position
- (CGRect)textRectForBounds:(CGRect)bounds {
    CGRect rect = [super textRectForBounds:bounds];
    UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 0);

    return UIEdgeInsetsInsetRect(rect, insets);
}

// Text position
- (CGRect)editingRectForBounds:(CGRect)bounds {
    CGRect rect = [super editingRectForBounds:bounds];
    UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 0);

    return UIEdgeInsetsInsetRect(rect, insets);
}

// Clear button position
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
    CGRect rect = [super clearButtonRectForBounds:bounds];

    return CGRectOffset(rect, -5, 0);
}

@end

注意:UIEdgeInsetsMake接受参数的顺序是:上，左，下，右。

Swift 3 /可在界面构建器中设计/单独的水平和垂直昆虫/可用

@IBDesignable
class TextFieldWithPadding: UITextField {

@IBInspectable var horizontalInset: CGFloat = 0
@IBInspectable var verticalInset: CGFloat = 0

override func textRect(forBounds bounds: CGRect) -> CGRect {
    return bounds.insetBy(dx: horizontalInset, dy: verticalInset)
}

override func editingRect(forBounds bounds: CGRect) -> CGRect {
    return bounds.insetBy(dx: horizontalInset , dy: verticalInset)
}

override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
    return bounds.insetBy(dx: horizontalInset, dy: verticalInset)
}
}

用法:

&

下面是在Swift 3中编写的相同子类UITextField。它与之前的Swift版本有很大的不同，正如你将看到的:

import UIKit

class MyTextField: UITextField
    {
    let inset: CGFloat = 10

    // placeholder position
    override func textRect(forBounds bounds: CGRect) -> CGRect
        {
        return bounds.insetBy(dx: inset, dy: inset)
        }

    // text position
    override func editingRect(forBounds bounds: CGRect) -> CGRect
        {
        return bounds.insetBy(dx: inset, dy: inset)
        }

    override func placeholderRect(forBounds bounds: CGRect) -> CGRect
        {
        return bounds.insetBy(dx: inset, dy: inset)
        }
    }

顺便说一句，如果你只想控制一侧的插入，你也可以像下面这样做。如果你把一个图像放在UITextField的顶部，但你想让它在用户看来是在文本框中，那么这个只调整左边插图的特殊例子就很方便了:

    override func editingRect(forBounds bounds: CGRect) -> CGRect
        {
        return CGRect.init(x: bounds.origin.x + inset, y: bounds.origin.y, width: bounds.width - inset, height: bounds.height)
        }