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自定义UITextField
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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