其实我喜欢UILabel
。他们很甜蜜。现在我必须转到UITextView
,因为UILabel
没有将文字垂直对齐到顶部。该死的。我真正需要的是文字阴影。 UILabel
拥有它。 UITextView
似乎没有它。但我猜那家伙只是使用相同的基础UIKit
NSString
添加?也许有人已经有解决这个问题的方法?我会覆盖什么?
答案 0 :(得分:153)
text.layer.shadowColor = [[UIColor whiteColor] CGColor];
text.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
text.layer.shadowOpacity = 1.0f;
text.layer.shadowRadius = 1.0f;
不要忘记加上顶部:
#import <QuartzCore/QuartzCore.h>
答案 1 :(得分:15)
答案
text.layer.shadowColor
为整个textView添加阴影,也许它有效,但它不仅会为文本添加阴影。
正确答案是:
CALayer *textLayer = ((CALayer *)[textView.layer.sublayers objectAtIndex:0]);
textLayer.shadowColor = [UIColor whiteColor].CGColor;
textLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);
textLayer.shadowOpacity = 1.0f;
textLayer.shadowRadius = 1.0f;
答案 2 :(得分:11)
Swift 3
let textView = UITextView(frame: view.frame)
textView.font = UIFont(name: "Helvetica", size: 64.0)
textView.textColor = .red
textView.text = "Hello World"
textView.layer.shadowColor = UIColor.black.cgColor
textView.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
textView.layer.shadowOpacity = 1.0
textView.layer.shadowRadius = 2.0
textView.layer.backgroundColor = UIColor.clear.cgColor
Swift 2.3
let textView = UITextView(frame: view.frame)
textView.font = UIFont(name: "Helvetica", size: 64.0)
textView.textColor = UIColor.redColor()
textView.text = "Hello World"
textView.layer.shadowColor = UIColor.blackColor().CGColor
textView.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
textView.layer.shadowOpacity = 1.0
textView.layer.shadowRadius = 2.0
textView.layer.backgroundColor = UIColor.clearColor().CGColor
答案 3 :(得分:9)
此 Swift示例使用向文本添加阴影的属性字符串方法。有关Swift中属性字符串的更多信息,请参阅this answer。此方法(与使用layer method相对)使您可以根据需要灵活地在一系列文本上设置阴影。
// Create a string
let myString = "Shadow"
// Create a shadow
let myShadow = NSShadow()
myShadow.shadowBlurRadius = 3
myShadow.shadowOffset = CGSize(width: 3, height: 3)
myShadow.shadowColor = UIColor.gray
// Create an attribute from the shadow
let myAttribute = [ NSAttributedStringKey.shadow: myShadow ]
// Add the attribute to the string
let myAttrString = NSAttributedString(string: myString, attributes: myAttribute)
// set the attributed text on a label
myLabel.attributedText = myAttrString // can also use with UITextView
针对Swift 4进行了更新
答案 4 :(得分:8)
在iOS 6+中使用属性文本
NSShadow * shadow = [[NSShadow alloc] init];
shadow.shadowColor = [UIColor blackColor];
shadow.shadowOffset = CGSizeMake(2, 2);
NSDictionary * textAttributes =
@{ NSForegroundColorAttributeName : [UIColor blueColor],
NSShadowAttributeName : shadow,
NSFontAttributeName : [UIFont boldSystemFontOfSize:20] };
textView.attributedText = [[NSAttributedString alloc] initWithString:@"Hello"
attributes:textAttributes];
答案 5 :(得分:0)
这取决于您使用的iOS版本。从iOS 6开始,支持单个阴影,您可以将其设置为NSAttributedString上的属性,然后在标签上设置该属性。
答案 6 :(得分:0)
迅捷4,迅捷4.2,迅捷5及以上 简单优雅的解决方案,可以轻松地从界面生成器中使用
extension UIView {
/* The color of the shadow. Defaults to opaque black. Colors created
* from patterns are currently NOT supported. Animatable. */
@IBInspectable var shadowColor: UIColor? {
set {
layer.shadowColor = newValue!.cgColor
}
get {
if let color = layer.shadowColor {
return UIColor(cgColor: color)
}
else {
return nil
}
}
}
/* The opacity of the shadow. Defaults to 0.4 Specifying a value outside the
* [0,1] range will give undefined results. Animatable. */
@IBInspectable var shadowOpacity: Float {
set {
layer.shadowOpacity = newValue
}
get {
return layer.shadowOpacity
}
}
/* The shadow offset. Defaults to (1, 2). Animatable. */
@IBInspectable var shadowOffset: CGPoint {
set {
layer.shadowOffset = CGSize(width: newValue.x, height: newValue.y)
}
get {
return CGPoint(x: layer.shadowOffset.width, y:layer.shadowOffset.height)
}
}
/* The blur radius used to create the shadow. Defaults to 3. Animatable. */
@IBInspectable var shadowRadius: CGFloat {
set {
layer.shadowRadius = newValue
}
get {
return layer.shadowRadius
}
}
}