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Detect backspace in empty UITextField
...yTextField
- (void)deleteBackward {
[super deleteBackward];
if ([_myDelegate respondsToSelector:@selector(textFieldDidDelete)]){
[_myDelegate textFieldDidDelete];
}
}
@end
Now simply add MyTextFieldDelegate to your UIViewController and set your UITextFields myDelegate to sel...
What does the @ symbol represent in objective-c?
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Get file size, image width and height before upload
...
when the value of i is alerted in the callback function reader.onload it shows a random increment! e.g. for 4 files the value as alerted was 0 3 2 1 . Can any one explain that?
– freerunner
Mar 2 '14 at 11:16
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Exporting a function in shell
...n parent shell (bash, sh or ksh) so that the function will be available to all the child process launced from the parent process?
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How do you check in python whether a string contains only numbers?
....isdigit():
From the isdigit documentation:
str.isdigit()
Return True if all characters in the string are digits and there is at least one character, False otherwise. Digits include decimal characters and digits that need special handling, such as the compatibility superscript digits. This covers ...
MySQL case insensitive select
...ble statement this way instead: varchar(20) CHARACTER SET utf8 COLLATE utf8_bin
– gregthegeek
Mar 19 '14 at 18:56
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How to add images to README.md on GitHub?
...ectory not the repo, so if you have 'myimage.png' in the same dir as 'about_pics.md' then the markup is:
– Rich
Mar 8 '17 at 2:06
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SELECT * WHERE NOT EXISTS
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Implementing comparison operators via 'tuple' and 'tie', a good idea?
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Detect application heap size in Android
...an be invoked as follows:
ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
int memoryClass = am.getMemoryClass();
Log.v("onCreate", "memoryClass:" + Integer.toString(memoryClass));
This method tells you approximately how many megabytes of heap your app should use if it w...