iOS development: Tips accumulate 2

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, get the global delegate object so that we can invoke the methods and variables in this object:

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

2. Get the main bundle of the program:

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.

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:

#import

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

NSString *path = [[NSBundle mainbundle] pathforresource:@ "Soundfilename" oftype:@ "wav"];

Systemsoundid Soundid;

Audioservicescreatesystemsoundid (__bridge cfurlref) [Nsurl Fileurlwithpath:path], &soundid);

Audioservicesplaysystemsound (Soundid);

4. Set and get property values in the class:

[Self setValue: Variable value forkey: variable name];

[Self valueforkey: variable name];

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

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

6. Get the device version number:

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

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

UIApplication *app = [UIApplication sharedapplication];

[[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:

For (NSString *family in [Uifont Familynames]) {

NSLog (@ "%@", family);

For (NSString *font in [Uifont fontnamesforfamilyname:family]) {

NSLog (@ "\t%@", font);

}

}

9. Add a click event for Uiimageview:

imageview.userinteractionenabled = YES;

UITapGestureRecognizer *singletap = [[UITapGestureRecognizer alloc] initwithtarget:self action: @selector ( Yourhandlingcode:)];

[ImageView Addgesturerecognizer:singletap];

10, add multi-language support: such as image picker component, the text of the button above it changes with the device language environment, but first in the project to add language:

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:

Controller.modaltransitionstyle = uimodaltransitionstylecoververtical;

[Self Presentmodalviewcontroller:controller animated:yes];

The effects available for use:

Uimodaltransitionstylecoververtical

Uimodaltransitionstylefliphorizontal

Uimodaltransitionstylecrossdissolve

Uimodaltransitionstylepartialcurl

To restore the previous page:

[Self dismissmodalviewcontrolleranimated:yes];

iOS development: Tips accumulate 2