我开了个好头。但是我想让这段代码更动态。
NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:string];
UIFont *font = [UIFont systemFontOfSize:10.0f];
UIFont *smallFont = [UIFont systemFontOfSize:9.0f];
[attString beginEditing];
[attString addAttribute:NSFontAttributeName value:(font) range:NSMakeRange(0, string.length - 2)];
[attString addAttribute:NSFontAttributeName value:(smallFont) range:NSMakeRange(string.length - 1, 1)];
假设我有以下字符串:
@"C3OC2OH4"
我想调整数字的字体大小,只是为了满足化学应用。我如何扫描上面的字符串,并创建一系列自定义范围来插入上面的函数,该函数调整字体大小?
您可以枚举字符并像这样应用属性。
NSString * string = @"C3OC2OH4";
NSMutableAttributedString * attributedString = [NSMutableAttributedString new];
NSDictionary * subscriptAttributes = @{NSFontAttributeName : [UIFont systemFontOfSize:10.0],
NSBaselineOffsetAttributeName : @(-5.0)};
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
NSCharacterSet * letterCharacterSet = [NSCharacterSet letterCharacterSet];
if ([substring rangeOfCharacterFromSet:letterCharacterSet].location != NSNotFound)
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:substring]];
else
[attributedString appendAttributedString:[[NSAttributedString alloc] initWithString:substring attributes:subscriptAttributes]];
}];
在这种情况下,substring
是每个字符,如果它是一个字母,则不加任何更改。如果它是一个数字,我们改变字体大小和移动基线。
好运。