-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{

[self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];

}

-(void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {

// string为整体字符串, editStr为需要修改的字符串

NSRange range = [string rangeOfString:editStr];

NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];

// 设置属性修改字体颜色UIColor与大小UIFont
[attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];

self.label.attributedText = attribute;

}