iOS Development tips build up

1. Get the global delegate object so that we can invoke the methods and variables in this object:

1. [(myappdelegate*) [[UIApplication Sharedapplication] delegate] mymethodormyvariable];

2. Get the main bundle of the program:

1. NSBundle *bundle = [NSBundle mainbundle];

Bundles can be understood as a folder in which the content follows a specific framework.

One of the main uses of the main bundle is the use of resource files, slices, sounds, plst files, etc. in the program.

1. Nsurl *plisturl = [bundle urlforresource:@"Plistfile" withextension:@ "plist"];

The above code obtains the path to the Plistfile.plist file.

3. Play the Sound in the program:

First add Audiotoolbox to the program:

Next, add #import in the. M method that has the play sound method:

1. #import <AudioToolbox/AudioToolbox.h>

Next, the code to play the sound is as follows:

1. NSString *path = [[NSBundle mainbundle] pathforresource:@"soundfilename" oftype:@"wav"];
2. Systemsoundid Soundid;
3. Audioservicescreatesystemsoundid (__bridge cfurlref) [Nsurl Fileurlwithpath:path], &soundid);
4. Audioservicesplaysystemsound (Soundid);

4. Set and get property values in the class:

1. [Self setValue: Variable value forkey: variable name];
2. [Self valueforkey: variable name];

5. Let a method execute after a certain period of time in the future:

1. [Self Performselector: @selector (method name) Withobject:nil Afterdelay: Delay time (s)];

6. Get the device version number:

1. float Version = [[[Uidevice Currentdevice] systemversion] floatvalue];

7, the capture program closed or into the background event:

1. UIApplication *app = [UIApplication sharedapplication];
2. [[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (applicationwillresignactive:) Name: Uiapplicationwillresignactivenotification Object:app];

Applicationwillresignactive: Add the desired action in this method

8. Check the fonts supported by the device:

1. For (NSString *family in [Uifont Familynames]) {
2. NSLog (@"%@", family);
3. For (NSString *font in [Uifont fontnamesforfamilyname:family]) {
4. NSLog (@"\t%@", font);
5. }
6. }

9. Add a click event for Uiimageview:

1. imageview.userinteractionenabled = YES;
2. UITapGestureRecognizer *singletap = [[UITapGestureRecognizer alloc] initwithtarget:self action: @selector ( Yourhandlingcode:)];
3. [ImageView Addgesturerecognizer:singletap];

10. Add multi-language support:
For example, a component such as Image picker, the text of the button above is changed as the device language environment changes, but first the language is added to the project:

11, enable the program to support devices such as itunes, such as the use of PC-side tools to the program documents to drag and drop files:

12, the page switch effect settings:

1. Controller.modaltransitionstyle = uimodaltransitionstylecoververtical;
2. [Self Presentmodalviewcontroller:controller animated:yes];

The effects available for use:

1. Uimodaltransitionstylecoververtical//New view appears from bottom up
2. Uimodaltransitionstylefliphorizontal//With the device's long axis as the center of the rollover appears
3. Uimodaltransitionstylecrossdissolve//Gradually show
4. Uimodaltransitionstylepartialcurl//Original view roll up

To restore the previous page:

1. [Self dismissmodalviewcontrolleranimated:yes];

13. Get the screenshot

1. -(UIImage *) Getscreenshot {
2. Uigraphicsbeginimagecontext (self.view.bounds.size);
3. [Self.view.layer Renderincontext:uigraphicsgetcurrentcontext ()];
4. UIImage *image = Uigraphicsgetimagefromcurrentimagecontext ();
5. Uigraphicsendimagecontext ();
6. return image;
7. }

iOS Development tips build up