我试图找到 labelText 中字母的位置。
Objective C 中的代码是
NSRange range = [@"Good,Morning" rangeOfString:@","];
NSString *prefix = [@"Good,Morning" substringToIndex:range.location];
CGSize size = [prefix sizeWithFont:[UIFont systemFontOfSize:18]];
CGPoint p = CGPointMake(size.width, 0);
NSLog(@"p.x: %f",p.x);
NSLog(@"p.y: %f",p.y);
请有人告诉我如何用 swift 编写上面的代码？我发现计算字符串的范围有点困难。
我最后会推荐以下变体：
extension String {
func characterPosition(character: Character, withFont: UIFont = UIFont.systemFontOfSize(18.0)) -> CGPoint? {
guard let range = self.rangeOfString(String(character)) else {
print("\(character) is missed")
return nil
}
let prefix = self.substringToIndex(range.startIndex) as NSString
let size = prefix.sizeWithAttributes([NSFontAttributeName: withFont])
return CGPointMake(size.width, 0)
}
}
客户代码：
let str = "Good,Morning"
let p = str.characterPosition(",")
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