我想插入一个UITextField的文本。
这可能吗?
我想插入一个UITextField的文本。
这可能吗?
当前回答
为UITextField添加填充的一个好方法是子类化UITextField并添加一个edgeInsets属性。然后设置edgeInsets和UITextField将相应地绘制。对于自定义的leftView或rightView集,这也能正确地发挥作用。
OSTextField.h
#import <UIKit/UIKit.h>
@interface OSTextField : UITextField
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
OSTextField.m
#import "OSTextField.h"
@implementation OSTextField
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if(self){
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
@end
其他回答
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。
在从UITextField派生的类中,至少重写以下两个方法:
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
如果你没有额外的内容,它可能就像这样简单:
return CGRectInset(bounds , 10, 10);
UITextField提供了几个可以覆盖的定位方法。
我子类化UITextField来处理这个,它支持左,上,右和底部的插入,以及清除按钮的定位。
MRDInsetTextField.h
#import <UIKit/UIKit.h>
@interface MRDInsetTextField : UITextField
@property (nonatomic, assign) CGRect inset;
@end
MRDInsetTextField.m
#import "MRDInsetTextField.h"
@implementation MRDInsetTextField
- (id)init
{
self = [super init];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_inset = CGRectZero;
}
return self;
}
- (void)setInset:(CGRect)inset {
_inset = inset;
[self setNeedsLayout];
}
- (CGRect)getRectForBounds:(CGRect)bounds withInset:(CGRect)inset {
CGRect newRect = CGRectMake(
bounds.origin.x + inset.origin.x,
bounds.origin.y + inset.origin.y,
bounds.origin.x + bounds.size.width - inset.origin.x - inset.size.width,
bounds.origin.y + bounds.size.height - inset.origin.y - inset.size.height
);
return newRect;
}
- (CGRect)textRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super textRectForBounds:bounds] withInset:_inset];
}
- (CGRect)placeholderRectForBounds:(CGRect)bounds {
return [self getRectForBounds:bounds withInset:_inset];
}
- (CGRect)editingRectForBounds:(CGRect)bounds {
return [self getRectForBounds:[super editingRectForBounds:bounds] withInset:_inset];
}
- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
return CGRectOffset([super clearButtonRectForBounds:bounds], -_inset.size.width, _inset.origin.y/2 - _inset.size.height/2);
}
@end
*_someTextField*来自nib/storyboard视图,带有MRDInsetTextField自定义类的用法示例
[(MRDInsetTextField*)_someTextField setInset:CGRectMake(5, 0, 5, 0)]; // left, top, right, bottom inset
Swift 5版本的克里斯托弗的答案与额外的用法示例
import UIKit
private class InsetTextField: UITextField {
var insets: UIEdgeInsets
init(insets: UIEdgeInsets) {
self.insets = insets
super.init(frame: .zero)
}
required init(coder aDecoder: NSCoder) {
fatalError("not intended for use from a NIB")
}
// placeholder position
override func textRect(forBounds bounds: CGRect) -> CGRect {
return super.textRect(forBounds: bounds.inset(by: insets))
}
// text position
override func editingRect(forBounds bounds: CGRect) -> CGRect {
return super.editingRect(forBounds: bounds.inset(by: insets))
}
}
extension UITextField {
class func textFieldWithInsets(insets: UIEdgeInsets) -> UITextField {
return InsetTextField(insets: insets)
}
}
用法:-
class ViewController: UIViewController {
private let passwordTextField: UITextField = {
let textField = UITextField.textFieldWithInsets(insets: UIEdgeInsets(top: 10, left: 15, bottom: 10, right: 15))
// ---
return textField
}()
}
你可以通过使文本字段成为UITextField的子类并覆盖-textRectForBounds:方法来调整文本在文本字段中的位置。