ios学习笔记

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 *)actionSheetdidDismissWithButtonIndex:(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)