我有一个常量字符串定义为
#define kNotificationMessage @"It's time to take your %@"
在目标C中使用
[NSString stringWithFormat:kNotificationMessage, medicineString]
作为给UIAlertView的消息。我们如何迅速实现这一目标?
如果我的应用程序移动到后台,我想关闭所有警告视图和操作表,比如控制,所以我将代码放在目标c中。
- (void)applicationDidEnterBackground:(UIApplication *)application
{
Class AVClass = [UIAlertView class];
Class ASClass = [UIActionSheet class];
for (UIView * subview in subviews){
NSLog(@"the class is %@",[subview class]);
- (IBAction) buttonPressed {
NSDate *selected = [datePicker date];
NSString *message = [[NSString alloc] initWithFormat:@"The date and time you selected is: %@", selected];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Date and Time Selected" message
下面是我的iOS应用程序的代码片段:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Do you like my hat?"
message:@"If so, please help spread the word by rating our app now?"
delegate:n
如果我真的喜欢这个
- (void)viewDidLoad {
[super viewDidLoad];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"test" delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil];
[alert show];
}
// Called when a button is clicked. The red view and alert will
我使用AFNetworking从服务器接收JSON,并使用这个JSON来确定目标-C函数的返回值。但是,不管JSON是什么,d的值与初始化时(作为假值)没有变化。为什么会发生这种情况?我的代码如下:
-(BOOL)someFunction{
__block BOOL d;
d = FALSE;
//the value of d is no longer changed
operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSUR