学步园

ActionSheet：

头文件里加<UIActionSheetDelegate>协议。

- (IBAction)buttonPressed:(id)sender {
    UIActionSheet *actionSheet = [[UIActionSheet alloc]
                                  initWithTitle:@"Are you sure?"
                                  delegate:self
                                  cancelButtonTitle:@"No Way!"
                                  destructiveButtonTitle:@"Yes, I’m Sure!"
                                  otherButtonTitles:nil];
    [actionSheet showInView:self.view];
}

- (void)actionSheet:(UIActionSheet *)actionSheet
didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex != [actionSheet cancelButtonIndex])
    {
        NSString *msg = nil;
        
        if (nameField.text.length > 0)
            msg = [[NSString alloc] initWithFormat:
                   @"You can breathe easy, %@, everything went OK.",
                   nameField.text];
        else
            msg = @"You can breathe easy, everything went OK.";
        
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle:@"Something was done"
                              message:msg
                              delegate:self
                              cancelButtonTitle:@"Phew!"
                              otherButtonTitles:nil];
        [alert show];
    }
}

从plist里读数据【08 - Sections】：

@property (strong, nonatomic) NSDictionary *names;
@property (strong, nonatomic) NSArray *keys;
NSString *path = [[NSBundle mainBundle] pathForResource:@"sortednames"
                                                     ofType:@"plist"];
    NSDictionary *dict = [[NSDictionary alloc]
                          initWithContentsOfFile:path];
    self.names = dict;
    
    NSArray *array = [[names allKeys] sortedArrayUsingSelector:
                      @selector(compare:)];
    self.keys = array;

是否iphone5

#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)