分享到新浪时字数超过140后跳转不出去，这里需要计算content的大小

swift 方法

private func sinaCountWord(str:NSString) -> Int {
        let n:Int = str.length
        var l:Int = 0
        var a:Int = 0
        var b:Int = 0
        var c:unichar
        for i in 0...n-1 {
            c = str.characterAtIndex(i)
            if isblank(Int32(c)) == Int32(1) {
                b += 1
            }else if isascii(Int32(c)) == Int32(1) {
                a += 1
            }else {
                l += 1
            }
        }
            if a == 0 && l == 0 {
                return 0
            }
            return l + Int(ceilf((Float(a+b))/2.0))
    }

OC方法

- (int)sinaCountWord:(NSString*)s
{
    int i,n=[s length],l=0,a=0,b=0;
    unichar c;
    for(i=0;i<n;i++)
    {
        c=[s characterAtIndex:i];
        if(isblank(c)){
            b++;
        }else if(isascii(c)){
            a++;
        }else{
            l++;
        }
    }
    if(a==0 && l==0) return 0;
    return l+(int)ceilf((float)(a+b)/2.0);
}