[iOS Dev] 不要套用UIBarStyleBlackTranslucent在NavigationBar上

今天用UIBarStyleBlackTranslucent在NavigationBar上, 發現整個top的位置會跑掉, 然後搜尋過後原來也有人遇到一樣的問題 Reference: http://stackoverflow.com/questions/228319/navigation-controller-transparent-bar-style-is-not-working

[iOS Dev] 點擊狀態列捲軸往上問題 Tap statusbar scroll to top doesn't work

我有一個UITableView結果發現scroll到下面時

竟然無法點statusbar自動捲到最上面

後來發現是因為我的UITableViewCell裡有UIWebView, 所以action被搶走了

所以只要把UIWebView的scroll to top關掉, 就可以避免這個問題

Code (iOS5):

webView.scrollView.scrollsToTop = NO; 

[iOS Dev] 更改UIKeyboard的底色為黑色

    [inputTextView becomeFirstResponder];
    [inputTextView setKeyboardAppearance:UIKeyboardAppearanceAlert];

原本的Default

更改keyboardAppearance 為 UIKeyboardAppearanceAlert

[iOS Dev] NSArray字串合併成NSString - How to join NSArray elements into an NSString?

Code:

	NSArray *args = [[NSArray alloc] initWithObjects:@"Apple", @"iOS", @"5.1", nil];
	NSLog(@"%@", [args componentsJoinedByString:@" "]);

view raw JoinNSArrayIntoNSString.m hosted with ❤ by GitHub

Result:

Apple iOS 5.1

Reference: http://stackoverflow.com/questions/1387440/how-to-join-nsarray-elements-into-an-nsstring

[iOS Dev] 關掉UIWebView的垂直拖曳反彈 Disable UIWebView "bouncing" vertically

	for (id subview in webView.subviews)
	if ([[subview class] isSubclassOfClass: [UIScrollView class]])
	((UIScrollView *)subview).bounces = NO;

view raw DisabledUIWebViewBounce.m hosted with ❤ by GitHub

Reference http://stackoverflow.com/questions/500761/stop-uiwebview-from-bouncing-vertically

[iOS Dev] Parse query string into dictionary

	- (NSDictionary *)parseQueryString:(NSString *)query {
	NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithCapacity:6];
	NSArray *pairs = [query componentsSeparatedByString:@"&"];
	for (NSString *pair in pairs) {
	NSArray *elements = [pair componentsSeparatedByString:@"="];
	NSString *key = [[elements objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
	NSString *val = [[elements objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
	[dict setObject:val forKey:key];
	}
	return dict;
	}

view raw parseQueryString.m hosted with ❤ by GitHub

Usage:

NSString *qs = @"username=hank&age=27&blog=whhnote.blogspot.com";
NSDictionary *queryParams = [self parseQueryString:qs];
NSLog(@"%@", queryParams);
NSLog(@"%@", [queryParams objectForKey:@"username"]); // get username from dict

So, you will get a dictionary look like

{
    age = 27;
    blog = "whhnote.blogspot.com";
    username = hank;
}

[Xcode] 設定預設文件開頭的 Organization

原本預設是 ___MyCompanyName___, 這樣新增檔案都要改一次

在Ternimal直接下此指令更改預設值

defaults write com.apple.Xcode PBXCustomTemplateMacroDefinitions '{ORGANIZATIONNAME="Hank's Company";}'

之後就不用改了

[iOS Dev] NSUserDefaults Save/Read/Clear 儲存/讀取/清除 速記

	// 定義名稱 define key
	#define kIsActive @"isActive"
	#define kUserName @"userName"
	// 讀取資料
	-(void)loadInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	NSLog(@"Name : %@", [defaults stringForKey:kUserName]);
	NSLog(@"isActive : %@", ([defaults boolForKey:kIsActive] ? @"YES" : @"NO"));
	}
	// 儲存資料
	-(void)saveInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	NSString *userName = @"Hank";
	BOOL isActive = YES;
	[defaults setObject:userName forKey:kUserName];
	[defaults setBool:isActive forKey:kIsActive];
	}
	// 清除資料
	-(void)clearInfo {
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	[defaults removeObjectForKey:kUserName];
	[defaults removeObjectForKey:kIsActive];
	}
	// 執行
	- (void)viewDidLoad
	{
	[super viewDidLoad];
	[self saveInfo];
	[self loadInfo];
	[self clearInfo];
	[self loadInfo];
	}

view raw NSUserDefaultsSample.m hosted with ❤ by GitHub

參考: NSUserDefaults Class Reference