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
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
其他回答
这是我发现的最快的方法,不需要做任何子类:
UIView *spacerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10., 10.)];
[textField setLeftViewMode:UITextFieldViewModeAlways];
[textField setLeftView:spacerView];
迅速:
let spacerView = UIView(frame:CGRect(x:0, y:0, width:10, height:10))
textField.leftViewMode = UITextFieldViewMode.Always
textField.leftView = spacerView
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)
}
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
}()
}
抛出另一个不需要子类化的解决方案:
UITextField *txtField = [UITextField new];
txtField.borderStyle = UITextBorderStyleRoundedRect;
// grab BG layer
CALayer *bgLayer = txtField.layer.sublayers.lastObject;
bgLayer.opacity = 0.f;
// add new bg view
UIView *bgView = [UIView new];
bgView.backgroundColor = [UIColor whiteColor];
bgView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
bgView.userInteractionEnabled = NO;
[txtField addSubview: bgView];
[txtField sendSubviewToBack: bgView];
在iOS 7和iOS 8上测试。这两个工作。苹果仍然有可能修改UITextField的层层次结构,把事情搞砸了。
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。