我有一个带有一些文字的UILabel,说“Hello World abcdefg”标签可以有多行,不同的字体大小等。
问题:如何在此UILabel中找到所有字母“d”的坐标。
逻辑第一步是找到字符串中这些字符的位置(UILabel.text),但是当它实际在屏幕上绘制时如何将其转换为坐标
我们的想法是找到那些坐标并在该角色的顶部绘制一些自定义内容(基本上用自定义图像覆盖它)
答案 0 :(得分:3)
在iPhone上测量文本的基本工具是UIStringDrawing.h
,但它们都不能满足您的需求。您基本上必须一次迭代一个字符的子字符串。当换行(结果更高)时,在最后一个未换行的字符之后拆分并将行高添加到y坐标。
- (CGSize)sizeWithFont:(UIFont *)font forWidth:(CGFloat)width lineBreakMode:(UILineBreakMode)lineBreakMode;
答案 1 :(得分:0)
自iOS 7.0问世以来,方法发生了变化。试试这个
- (CGFloat)charactersOffsetBeforeDayPartOfLabel {
NSRange range = [[self stringFromDate:self.currentDate] rangeOfString:[NSString stringWithFormat:@"%i",[self dayFromDate:self.currentDate]]];
NSString *chars = [[self stringFromDate:self.currentDate] substringToIndex:range.location];
NSMutableArray *arrayOfChars = [[NSMutableArray alloc]init];
[chars enumerateSubstringsInRange:NSMakeRange(0, [chars length]) options:(NSStringEnumerationByComposedCharacterSequences) usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
[arrayOfChars addObject:substring];
}];
CGFloat charsOffsetTotal = 0;
for (NSString *i in arrayOfChars){
NSDictionary *attributes = @{NSFontAttributeName: [UIFont fontWithName:@"Helvetica Neue" size:16.0f]};
charsOffsetTotal += [i sizeWithAttributes:attributes].width;
}
return charsOffsetTotal;
}
答案 2 :(得分:0)
在这里:
fileprivate let selfSizing = UILabel()
class DualColorLabel: UILabel
{
var filled: UIColor?
var unfilled: UIColor?
var origin: String?
var widths: [CGFloat] = []
var fuckupLockup = false
override var text: String? {
didSet {
if fuckupLockup {
print ("SDBOFLAG-13822 wtf?")
}
}
}
func setupColorsAndText(filled: UIColor,
unfilled: UIColor)
{
self.filled = filled
self.unfilled = unfilled
guard let text = origin, text.count > 0 else {
assertionFailure("usage error")
return
}
guard font != nil else {
usageError()
return
}
for index in 1...text.count {
let s = String.Index(utf16Offset: 0, in: text)
let e = String.Index(utf16Offset: index, in: text)
let beginning = text[s..<e]
let p = String(beginning)
selfSizing.font = font
selfSizing.text = p
let size = selfSizing.sizeThatFits(CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude))
let width = size.width
widths.append(width)
}
}
func setupfill(adjusted: CGRect)
{
assert(adjusted.origin.x <= 0, "fixed this code for fill in the middle: currently supported only fill at start")
let endOffset = adjusted.width + adjusted.origin.x
guard let font = self.font else {
usageError()
return
}
guard let origin = origin, let filled = filled,
let unfilled = unfilled else {
usageError()
return
}
var idx = String.Index(utf16Offset: origin.count, in: origin)
for (index, width) in widths.enumerated() {
if endOffset < width {
idx = String.Index(utf16Offset: index, in: origin)
print ("SDBOFLAG-13822 index \(index) for text \(origin)")
break
}
}
let total = NSMutableAttributedString()
do {
let s = String.Index(utf16Offset: 0, in: origin)
let beginning = origin[s..<idx]
let p = String(beginning)
print("SDBOFLAG-13822 filled text \(p)")
let filledAttributes:
[NSAttributedString.Key : Any] = [NSAttributedString.Key.foregroundColor:
// UIColor.yellow,
filled,
NSAttributedString.Key.font:
font
]
let filledPortion = NSAttributedString(string: p, attributes: filledAttributes)
total.append(filledPortion)
}
let unfilledAttributes:
[NSAttributedString.Key : Any] = [NSAttributedString.Key.foregroundColor:
// UIColor.blue,
unfilled,
NSAttributedString.Key.font: font]
let e = String.Index(utf16Offset: origin.count, in: origin)
let ending = origin[idx..<e]
let str = String(ending)
print("SDBOFLAG-13822 unfilled text \(str)")
let unfilledPortion = NSAttributedString(string: str, attributes: unfilledAttributes)
total.append(unfilledPortion)
self.attributedText = total
fuckupLockup = true
}
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
}
func usageError()
{
assertionFailure("usage error")
}
根据提供的建议,片段的宽度计算将进入widths数组。