1.打电话
// 告诉系统要拨打那个电话号码
NSURL *url = [NSURL URLWithString:@"tel://10010"]; // sms 发短信
// 拨打电话号码
[[UIApplication sharedApplication] openURL:url];
2.scrollView 点击屏幕回收键盘
遵循手势代理<UIGestureRecognizerDelegate>
// 1.为scrollview添加手势识别器
UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(lyh_tapGesture)];
singleFingerOne.delegate =self;
[self.view addGestureRecognizer:singleFingerOne];
- (void)lyh_tapGesture
{
[self.fd_content_Tf resignFirstResponder];
[self.phone_qq_Tf resignFirstResponder];
}
3.textView 限制输入个数
遵循textView代理 <UITextViewDelegate>
#define kMaxInputNumber 20 // textView输入最大个数量
- (void)textViewDidChange:(UITextView *)textView
{
UITextRange *selectedRange = [textView markedTextRange];
//获取高亮部分
UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];
//如果在变化中是高亮部分在变,就不要计算字符了
if (selectedRange && pos) {
return;
}
NSString *nsTextContent = textView.text;
NSInteger existTextNum = nsTextContent.length;
if (existTextNum > kMaxInputNumber)
{
//截取到最大位置的字符(由于超出截部分在should时被处理了所在这里这了提高效率不再判断)
NSString *s = [nsTextContent substringToIndex:kMaxInputNumber];
[textView setText:s];
// 最大就提示
NSString *message = [NSString stringWithFormat:@"最多只能输入%i个字", kMaxInputNumber];
UIAlertView * alert=[[UIAlertView alloc] initWithTitle:@"提示" message: message delegate:nil cancelButtonTitle:@"返回" otherButtonTitles: nil];
// 我使用的SV_HUD
//NSString *message = [NSString stringWithFormat:@"最多只能输入%i个字",kMaxInputNumber];
//[SVProgressHUD showErrorWithStatus:message];
}
//不让显示负数
self.number_Lb.text = [NSString stringWithFormat:@"%ld/%d",MAX(0,kMaxInputNumber - existTextNum),kMaxInputNumber];
}