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
下面是一个全面的Swift答案,包括一个leftView(自定义图标)和一个自定义清除按钮,两者都设置在界面生成器中,具有可定制的insets。
import UIKit
@IBDesignable
class InsetTextField: UITextField {
@IBInspectable var leftInset:CGFloat = 0
@IBInspectable var rightInset:CGFloat = 0
@IBInspectable var icon:UIImage? { didSet {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 16, height: 16))
imageView.image = icon
self.leftView = imageView
self.leftViewMode = .Always
} }
@IBInspectable var clearButton:UIImage? { didSet {
let button = UIButton(type: .Custom)
button.setImage(clearButton, forState: .Normal)
button.addTarget(self, action: "clear", forControlEvents: UIControlEvents.TouchUpInside)
button.frame = CGRect(x: 0, y: 0, width: 18, height: 18)
self.rightView = button
self.rightViewMode = .WhileEditing
} }
func clear() {
self.text = ""
}
override func leftViewRectForBounds(bounds: CGRect) -> CGRect {
var height:CGFloat = 0
var width:CGFloat = 0
if let leftView = self.leftView {
height = leftView.bounds.height
width = leftView.bounds.width
}
return CGRect(x: leftInset, y: bounds.height/2 - height/2, width: width, height: height)
}
override func rightViewRectForBounds(bounds: CGRect) -> CGRect {
var height:CGFloat = 0
var width:CGFloat = 0
if let rightView = self.rightView {
height = rightView.bounds.height
width = rightView.bounds.width
}
return CGRect(x: bounds.width - width - rightInset, y: bounds.height/2 - height/2, width: width, height: height)
}
}
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。
解决方案:实际有效且适用于所有情况的解决方案:
应该使用offsetBy而不是insetBy。 也应该调用超函数来获取原始的Rect。 Bounds故障。你需要抵消原来的X, Y,边界有X, Y为零。 原始的x, y可以是非零,例如当设置UITextField的leftView时。
示例:
override func textRect(forBounds bounds: CGRect) -> CGRect {
return super.textRect(forBounds: bounds).offsetBy(dx: 0.0, dy: 4)
}
override func editingRect(forBounds bounds: CGRect) -> CGRect {
return super.editingRect(forBounds: bounds).offsetBy(dx: 0.0, dy: 4)
}
我发现了罗伯托发布的选项。buratti是最快的解决方案,这里是Swift:
let leftView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: textField.frame.size.height))
leftView.backgroundColor = textField.backgroundColor
textField.leftView = leftView
textField.leftViewMode = UITextField.ViewMode.always
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
快速解决没有子类&也检查
extension UITextField {
@IBInspectable var textInsets: CGPoint {
get {
return CGPoint.zero
}
set {
layer.sublayerTransform = CATransform3DMakeTranslation(newValue.x, newValue.y, 0);
}
}
}