如何设置UITextField的leftView和rightView的inset

系统为我们提供了可以来重写的apileftViewRectForBounds,但这需要你去创建一个子类,那么可不可以不使用继承来实现呢。

可以使用类别来实现。
.h文件

#import <UIKit/UIKit.h>

@interface UITextField (Extension)

@property (nonatomic,assign) UIEdgeInsets leftViewInset;
@property (nonatomic,assign) UIEdgeInsets rightViewInset;


@end

.m文件

#import "UITextField+Extension.h"


@implementation UITextField (Extension)


-(void)setLeftViewInset:(UIEdgeInsets)leftViewInset{
    if (self.leftView) {
        UIView *leftView = self.leftView;
        self.leftView = nil;
        UIView *backView = [[UIView alloc]init];
        [backView addSubview:leftView];
        [leftView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.mas_equalTo(leftViewInset.left);
            make.centerY.mas_equalTo(backView.mas_centerY).offset(leftViewInset.bottom - leftViewInset.top);
        }];
        self.leftView = backView;
    }
}

-(UIEdgeInsets)leftViewInset{
    return UIEdgeInsetsZero;
}


-(void)setRightViewInset:(UIEdgeInsets)rightViewInset{
    if (self.rightView) {
        UIView *rightView = self.rightView;
        self.rightView = nil;
        UIView *backView = [[UIView alloc]init];
        [backView addSubview:rightView];
        [rightView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.mas_equalTo(rightViewInset.left);
            make.centerY.mas_equalTo(backView.mas_centerY).offset(rightViewInset.bottom - rightViewInset.top);
        }];
        self.rightView = backView;
    }
}

-(UIEdgeInsets)rightViewInset{
    return UIEdgeInsetsZero;
}

@end

代码中使用了Masonry框架,有什么问题可以在下方留言,码字不易,点个赞吧:-D

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