在我的应用程序中,我有一个文本字段,从用户输入一些数字,所以我将键盘类型设置为"数字键盘"但现在我被困在如何用户完成输入时我应该解雇它.我知道我必须使用委托方法"textfieldShouldReturn",但问题是数字键盘没有返回键.所以是否有必要在键盘上添加自定义完成键或还有其他方法？
我们如何在UILabel上以数字格式显示文本(七段显示),类似于数字时钟中显示文本的方式.
我正在开发一个计算用户行进距离的应用程序.我正在使用CLLocationManager类来执行此操作,但我最初获取缓存数据,并且距离变量也以突然的速率增加.请帮帮我...我用过以下代码....
注意:距离是静态变量.这里
- (void)viewDidLoad {
[super viewDidLoad];
//bestEffortAtLocation = nil;
oldLocat = [[CLLocation alloc]init];
newLocat = [[CLLocation alloc]init];
locationManager =[[CLLocationManager alloc]init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation{
// test that the horizontal accuracy does not indicate an invalid measurement
if (newLocation.horizontalAccuracy < 0) return;
NSLog(@"accuracy %d",newLocation.horizontalAccuracy);
// test the age of the location measurement to determine if the measurement is cached
// in most cases you will …