Favorites for IOS Development common code block _ios

To remove an array element while traversing a mutable array

Nsmutablearray *copyarray = [Nsmutablearray Arraywitharray:array];  
NSString *str1 = @ "Zhangsan"; 
For (Addressperson *pername in Copyarray) { 
  if ([[Pername name] isequaltostring:str1]) { 
    [array removeobject: Pername]; 
  } 
 

Get the current language of the system

NSString *currentlanguage = [[Nslocale preferredlanguages] objectatindex:0];
NSLog (@ "currentlanguage =%@", currentlanguage);

if ([Currentlanguage containsstring:@ "Zh-hans"]) {
  NSLog (@ "Zh-hans Simplified Chinese");
} else if ([Currentlanguage containsstring:@ "Zh-hant"]) {
  NSLog (@ "zh-hant Traditional Chinese");
}

UITableView group style top blank handling

UIView *view = [[UIView alloc] Initwithframe:cgrectmake (0, 0, 0, 0.1)];
Self.tableView.tableHeaderView = view;

UITableView of the plain style, remove the end of the zone head stagnation effect

-(void) Scrollviewdidscroll: (Uiscrollview *) ScrollView
{
  cgfloat sectionheaderheight = sectionhead.height;
  if (Scrollview.contentoffset.y<=sectionheaderheight&&scrollview;. contentoffset.y>=0)
  {
    Scrollview.contentinset = uiedgeinsetsmake (-scrollview.contentoffset.y, 0, 0, 0);
  }
  else if (scrollview.contentoffset.y>=sectionheaderheight)
  {
    Scrollview.contentinset = uiedgeinsetsmake (-sectionheaderheight, 0, 0, 0);
  }
}

Get the controller where a view is located

-(Uiviewcontroller *) Viewcontroller
{
 Uiviewcontroller *viewcontroller = nil; 
 Uiresponder *next = Self.nextresponder;
 while (next)
 {
  if ([Next Iskindofclass:[uiviewcontroller class]])
  {
   Viewcontroller = ( Uiviewcontroller *) Next;   
   break;  
  Next = Next.nextresponder; 
 } 
  return viewcontroller;
}

Two ways to delete nsuserdefaults all records

Method One
nsstring *appdomain = [[NSBundle mainbundle] bundleidentifier];
[[Nsuserdefaults Standarduserdefaults] removepersistentdomainforname:appdomain];


Method two
-(void) resetdefaults
{
  nsuserdefaults * defs = [nsuserdefaults standarduserdefaults];
  Nsdictionary * dict = [defs dictionaryrepresentation];
  For (ID key in dict)
  {
    [defs Removeobjectforkey:key];
  }
  [Defs synchronize];
}

Print system all registered font names

void Enumeratefonts ()
{
  for (nsstring *familyname in [Uifont familynames])
  {
    NSLog (@ "%@", Familyname) ;        
    Nsarray *fontnames = [Uifont fontnamesforfamilyname:familyname];    
    For (NSString *fontname in FontNames)
    {
      NSLog (@ "\t|-%@", fontname);
    }
  }

Get the color of a point in a picture

-(uicolor*) Getpixelcoloratlocation: (cgpoint) point inimage: (UIImage *) image
{

  uicolor* color = nil;
  Cgimageref inimage = image. Cgimage;
  Cgcontextref cgctx = [self createargbbitmapcontextfromimage:inimage];

  if (Cgctx = = NULL) {return
    nil/* error/
  }
  size_t w = cgimagegetwidth (inimage);
  size_t h = cgimagegetheight (inimage);
  CGRect rect = {{0,0},{w,h}};

  Cgcontextdrawimage (Cgctx, rect, inimage);
  unsigned char* data = Cgbitmapcontextgetdata (CGCTX);
  if (data!= NULL) {
    int offset = 4* ((W*round (POINT.Y)) +round (point.x));
    int alpha = Data[offset];
    int red = data[offset+1];
    int green = data[offset+2];
    int blue = data[offset+3];
    color = [Uicolor colorwithred: (red/255.0f) Green: (green/255.0f) Blue:
         (blue/255.0f) Alpha: (alpha/255.0f)];
  }
  cgcontextrelease (CGCTX);
  if (data) {free
    (data);
  }
  return color;
}

String inversion

The first type:
-(NSString *) reversewordsinstring: (NSString *) str
{  
  nsmutablestring *newstring = [ Nsmutablestring alloc] initWithCapacity:str.length];
  for (Nsinteger i = str.length-1 i >= 0; I-)
  {
    Unichar ch = [str characteratindex:i];    
    [newstring appendformat:@ '%c ', ch];  
  }  
   return newstring;
}

The second type:
-(nsstring*) reversewordsinstring: (nsstring*) str
{  
   nsmutablestring *reverstring = [ Nsmutablestring StringWithCapacity:str.length];  
   [Str enumeratesubstringsinrange:nsmakerange (0, str.length) options:nsstringenumerationreverse | Nsstringenumerationbycomposedcharactersequences usingblock:^ (NSString *substring, NSRange SubstringRange, NSRange Enclosingrange, BOOL *stop) { 
     [reverstring appendstring:substring];             
   }];  
   return reverstring;
}

No lock screen

The first kind
[uiapplication sharedapplication].idletimerdisabled = YES;
The second
[[UIApplication sharedapplication] setidletimerdisabled:yes];

Modal launch Transparent interface

Uiviewcontroller *VC = [[Uiviewcontroller alloc] init];
Uinavigationcontroller *na = [[Uinavigationcontroller alloc] INITWITHROOTVIEWCONTROLLER:VC];

if ([[[[[Uidevice Currentdevice] systemversion] floatvalue] >= 8.0)
{
   Na.modalpresentationstyle = Uimodalpresentationovercurrentcontext;
}
else
{
   self.modalpresentationstyle=uimodalpresentationcurrentcontext;
}

[Self Presentviewcontroller:na animated:yes completion:nil];

iOS jump to App store download app rating

[[UIApplication sharedapplication] Openurl:[nsurl urlwithstring:@ "itms-apps://itunes.apple.com/webobjects/ Mzstore.woa/wa/viewcontentsuserreviews?type=purple+software&id=appid "]];

Manually change the color of the iOS status bar

-(void) Setstatusbarbackgroundcolor: (Uicolor *) color
{
  UIView *statusbar = [[UIApplication Sharedapplication] valueforkey:@ "Statusbarwindow"] valueforkey:@ "StatusBar"];

  if ([StatusBar respondstoselector: @selector (setbackgroundcolor:)])
  {
    statusbar.backgroundcolor = color;  
  }
}

To determine whether the current Viewcontroller is a push or present display

Nsarray *viewcontrollers=self.navigationcontroller.viewcontrollers;

if (Viewcontrollers.count > 1)
{
  if ([viewcontrollers objectatindex:viewcontrollers.count-1] = self)
  {
    //push mode
    [Self.navigationcontroller popviewcontrolleranimated:yes];
  }
}
else
{
  //present mode
  [self dismissviewcontrolleranimated:yes completion:nil];
}

Get the Launchimage picture you actually use

-(NSString *) getlaunchimagename
{
  cgsize viewsize = self.window.bounds.size;
  Vertical screen  
  NSString *vieworientation = @ "Portrait"; 
  NSString *launchimagename = nil;  
  nsarray* imagesdict = [[[NSBundle Mainbundle] infodictionary] valueforkey:@ "Uilaunchimages"];
  For (nsdictionary* dict in imagesdict)
  {
    Cgsize imagesize = cgsizefromstring (dict[@ "uilaunchimagesize"]);
    if (Cgsizeequaltosize (ImageSize, viewsize) && [vieworientation isequaltostring:dict[@] Uilaunchimageorientation "]])
    {
      launchimagename = dict[@" Uilaunchimagename "];    
    }  
  return launchimagename;
}

iOS gets first response on current screen

UIWindow * Keywindow = [[UIApplication sharedapplication] Keywindow];
UIView * FirstResponder = [Keywindow performselector: @selector (FirstResponder)];

Determine if an object follows a protocol

if ([Self.selectedcontroller conformstoprotocol: @protocol (refreshptotocol)])
{
   [Self.selectedcontroller Performselector: @selector (Ontriggerrefresh)];
}

Determine if view is a child view of the specified views
BOOL Isview = [TextView IsDescendantOfView:self.view];

Nsarray fast sum maximum minimum and average value

Nsarray *array = [Nsarray arraywithobjects:@ "2.0", @ "2.3", @ "3.0", @ "4.0", @ "ten", nil];
CGFloat sum = [[Array valueforkeypath:@ ' @sum. Floatvalue '] floatvalue];
cgfloat avg = [[Array valueforkeypath:@ ' @avg. Floatvalue '] floatvalue];
CGFloat Max =[[array valueforkeypath:@ "@max. Floatvalue"] floatvalue];
CGFloat min =[[array valueforkeypath:@ "@min. Floatvalue"] floatvalue];
NSLog (@ "%f\n%f\n%f\n%f", sum,avg,max,min);

Modify the text color of placeholder in Uitextfield
[TextField setvalue:[uicolor Redcolor] forkeypath:@ "_placeholderlabel.textcolor"];

Gets all the subclasses of a class

+ (Nsarray *) allsubclasses
{
  class myClass = [self Class];
  Nsmutablearray *mysubclasses = [Nsmutablearray array];
  unsigned int numofclasses;
  Class *classes = objc_copyclasslist (&numOfClasses;);
  for (unsigned int ci = 0; ci < numofclasses; ci++)
  {
    Class superclass = Classes[ci];
    do{
      superclass = Class_getsuperclass (superclass); while
    (superclass && superclass!=);

    if (superclass)
    {
      [mysubclasses addobject:classes[ci]];
    }
  Free (classes);
  return mysubclasses;
}

Conversion of Arabic numerals to Chinese format

+ (NSString *) Translation: (NSString *) arebic {nsstring *str = arebic;
  Nsarray *arabic_numerals = @[@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", @ "8", @ "9", @ "0"];
  Nsarray *chinese_numerals = @[@ "One", @ "two", @ "three", @ "four", @ "five", @ "six", @ "seven", @ "eight", @ "nine", @ "0"];
  Nsarray *digits = @[@ "A", @ "ten", @ "hundred", @ "thousand", @ "Million", @ "ten", @ "hundred", @ "thousand", @ "billion", @ "ten", @ "hundred", @ "thousand", @ "trillion"];

  Nsdictionary *dictionary = [nsdictionary dictionarywithobjects:chinese_numerals forkeys:arabic_numerals];
  Nsmutablearray *sums = [Nsmutablearray array];
    for (int i = 0; i < str.length i + +) {nsstring *substr = [Str Substringwithrange:nsmakerange (I, 1)];
    NSString *a = [dictionary objectforkey:substr];
    NSString *b = digits[str.length-i-1];
    NSString *sum = [a stringbyappendingstring:b]; if ([a isequaltostring:chinese_numerals[9]]) {if ([b isequaltostring:digits[4]] | |
      [b isequaltostring:digits[8]])
        {sum = b; if ([[[Sums Lastobject] isequaltostring:chinese_numerals[9]]) {[Sums removeLastobject];
      }}else {sum = chinese_numerals[9];
      } if ([[[Sums Lastobject] isequaltostring:sum]) {continue;
  } [sums addobject:sum];
  } nsstring *sumstr = [sums componentsjoinedbystring:@ "];
  NSString *chinese = [Sumstr substringtoindex:sumstr.length-1];
  NSLog (@ "%@", str);
  NSLog (@ "%@", Chinese);
return Chinese;

 }

Remove implicit animation from Uicollectionview

Method one
[UIView performwithoutanimation:^{
  [CollectionView Reloaditemsatindexpaths:@[[nsindexpath Indexpathforitem:index insection:0]

]]; Method two
[UIView animatewithduration:0 animations:^{
  [CollectionView performbatchupdates:^{
    [ CollectionView Reloaditemsatindexpaths:@[[nsindexpath Indexpathforitem:index insection:0]];
  } Completion:nil];

Method three
[UIView Setanimationsenabled:no];
[Self.trackpanel performbatchupdates:^{
  [CollectionView Reloaditemsatindexpaths:@[[nsindexpath Indexpathforitem:index insection:0]]];
completion:^ (BOOL finished) {
  [UIView setanimationsenabled:yes];
}];

Code to determine if the mailbox format is correct

-(BOOL) Isvalidateemail: (NSString *) email

{

NSString *emailregex = @ "[a-z0-9a-z._%+-]+@[a-za-z0-9.-]+\\.[　　a-za-z]{2,4} ";

Nspredicate *emailtest = [nspredicate predicatewithformat:@ "SELF matches%@", Emailregex];

return [Emailtest Evaluatewithobject:email];

}

Word limits for Uitextfield in iOS

Register <UITextFieldTextDidChangeNotification> notify in viewdidload [[Nsnotificationcenter Defaultcenter]addobserver
: Self selector: @selector (textfilededitchanged:) name:@ "Uitextfieldtextdidchangenotification" Object:mytextfield];  Implementation Listener #pragma mark-notification method-(void) textfieldeditchanged: (nsnotification *) obj {Uitextfield *textfield =
  (Uitextfield *) Obj.object;

  NSString *tobestring = Textfield.text;
  Get the highlighted part uitextrange *selectedrange = [TextField markedtextrange];

  Uitextposition *position = [TextField positionFromPosition:selectedRange.start offset:0]; Without a highlighted word, words are counted and restricted if (!position) {if (Tobestring.length > Max_starwords_length) {Nsrang
      e Rangeindex = [tobestring rangeofcomposedcharactersequenceatindex:max_starwords_length];
      if (rangeindex.length = = 1) {textfield.text = [tobestring substringtoindex:max_starwords_length]; else {Nsrange Rangerange = [tobestring rangeofcomPosedcharactersequencesforrange:nsmakerange (0, max_starwords_length)];
      Textfield.text = [tobestring substringwithrange:rangerange];

 }
    }
  }
}

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