iOS 開發筆記 - 計算一個字的寬度

程式碼：     NSString *words = @"Hello World! 您好！";
    for( int i=0 ; i<[words length] ; ++i ) {
        unichar word = [words characterAtIndex:i];
        CGSize wordSize = [[NSString stringWithFormat:@"%C", word] sizeWithAttributes:nil];
        NSLog(@"Char: %C, Font Width: %f", word, wordSize.width);
    }

Char: H, Font Width: 8.666016
Char: e, Font Width: 6.673828
Char: l, Font Width: 2.666016
Char: l, Font Width: 2.666016
Char: o, Font Width: 6.673828
Char:  , Font Width: 3.333984
Char: W, Font Width: 11.326172
Char: o, Font Width: 6.673828
Char: r, Font Width: 3.996094
Char: l, Font Width: 2.666016
Char: d, Font Width: 6.673828
Char: !, Font Width: 3.333984
Char:  , Font Width: 3.333984
Char: 您, Font Width: 12.000000
Char: 好, Font Width: 12.000000
Char: ！, Font Width: 12.000000

若要指定 font ，可以透過設定 Attributes：

@{
    NSFontAttributeName: [UIFont fontWithName:@"Courier" size:16]
}

指定 Courier 字型： Char: H, Font Width: 9.601562
Char: e, Font Width: 9.601562
Char: l, Font Width: 9.601562
Char: l, Font Width: 9.601562
Char: o, Font Width: 9.601562
Char: , Font Width: 9.601562
Char: W, Font Width: 9.601562
Char: o, Font Width: 9.601562
Char: r, Font Width: 9.601562
Char: l, Font Width: 9.601562
Char: d, Font Width: 9.601562
Char: !, Font Width: 9.601562
Char: , Font Width: 9.601562
Char: 您, Font Width: 16.000000
Char: 好, Font Width: 16.000000
Char: ！, Font Width: 16.000000