ios的计算字符串的长度
1.
lengthViewController.h
import
@interface lengthViewController : UIViewController{
IBOutlet UILabel *dispLenLabel;
IBOutlet UITextField *inputField;
}
-(IBAction)btnDown:(id)sender;
@end
2.
lengthViewController.m
#import "lengthViewController.h"
@implementation lengthViewController
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
-(IBAction)btnDown:(id)sender{
int len=inputField.text.length;
if(len){
//如果不为空
dispLenLabel.text=[NSString stringWithFormat:@"%d",len];
}else{
//给出警告
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"错误提示" message:@"请输入内容" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert show];
// [alert release];
}
}
@end