自定义UITextField

来源：互联网发布：freebsd 编译nginx 编辑：程序博客网时间：2024/04/30 07:35

目的是实现如下的效果：

UITextField的leftView是自定义的UIView，其中：

1、包含一个居中显示的icon，并且上，左，下各有1px的间隙

2、左上和左下是圆角，右边没有圆角

居中展示icon

关键是leftView不是UIImageView，而是把UIImageView设置为subview

CGFloat height = frame.size.height;        UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 1, height - 1, height - 2)];        UIImageView *icon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:iconName]];icon.frame = CGRectMake(height / 4, height / 4, height / 2, height / 2);[leftView addSubview:icon];

上面的代码，使icon在leftView居中显示

制造1px间隙

top和bottom的间隙很容易做，只要令leftView的height比UITextField的height少2，然后y设置为1

左侧的间隙比较麻烦，首先将width设置为比UITextField的width少1。但是直接设置x为1无效，需要override以下方法：

-(CGRect) leftViewRectForBounds:(CGRect)bounds {    CGRect iconRect = [super leftViewRectForBounds:bounds];    iconRect.origin.x += 1;    return iconRect;}

制造部分圆角

制造所有的圆角比较简单，只需要：

self.layer.cornerRadius = 5;

但是要制造部分圆角，就比较麻烦：

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:leftView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomLeft cornerRadii:CGSizeMake(5, 5)];CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];maskLayer.frame = leftView.bounds;maskLayer.path = maskPath.CGPath;leftView.layer.mask = maskLayer;

创建阴影

self.layer.shadowColor = [UIColor colorWithRed:132/255.0f green:214/255.0f blue:219/255.0f alpha:1.0f].CGColor;self.layer.shadowOpacity = 0.5;self.layer.shadowOffset = CGSizeMake(3, 3);

完整的代码

@implementation LosTextField-(id)initWithFrame:(CGRect)frame Icon:(NSString*)iconName{    self = [super initWithFrame:frame];    if (self) {                CGFloat height = frame.size.height;                UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 1, height - 1, height - 2)];        leftView.backgroundColor = [UIColor colorWithRed:132/255.0f green:214/255.0f blue:219/255.0f alpha:1.0f];                UIImageView *icon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:iconName]];        icon.frame = CGRectMake(height / 4, height / 4, height / 2, height / 2);        [leftView addSubview:icon];                UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:leftView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomLeft cornerRadii:CGSizeMake(5, 5)];        CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];        maskLayer.frame = leftView.bounds;        maskLayer.path = maskPath.CGPath;        leftView.layer.mask = maskLayer;                self.leftView = leftView;        self.leftViewMode = UITextFieldViewModeAlways;    }    return self;}-(CGRect) leftViewRectForBounds:(CGRect)bounds {    CGRect iconRect = [super leftViewRectForBounds:bounds];    iconRect.origin.x += 1;    return iconRect;}@end

self.username = [[LosTextField alloc] initWithFrame:CGRectMake(20, 150, 280, 40) Icon:@"login_username"];

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