大约有 2,400 项符合查询结果（耗时：0.0103秒） [XML]
Programmatically create a UIView with color gradient
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Objective-C:
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view.bounds;
gradient.colors = @[(id)[UIColor whiteColor].CGColor, (id)[UIColor blackColor].CGColor];
[v...
How do I set up a simple delegate to communicate between two view controllers?
...th {
ChildViewController *detailViewController = [[ChildViewController alloc] init];
// Assign self as the delegate for the child view controller
detailViewController.delegate = self;
[self.navigationController pushViewController:detailViewController animated:YES];
}
// Implement th...
Effects of changing Django's SECRET_KEY
..._random_secret_key; print(get_random_secret_key())"
s!)5@5s79sp=92a+!f4v!1g0d0+64ln3d$xm1f_7=749ht&-zi
$ ./manage.py shell -c "from django.core.management.utils import get_random_secret_key; print(get_random_secret_key())"
_)+%kymd=f^8o_fea1*yro7atz3w+5(t2/lm2cz70*e$2mn\g3
$
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How to split a string literal across multiple lines in C / Objective-C?
...the Quote idea for Objective-C:
#define NSStringMultiline(...) [[NSString alloc] initWithCString:#__VA_ARGS__ encoding:NSUTF8StringEncoding]
NSString *sql = NSStringMultiline(
SELECT name, age
FROM users
WHERE loggedin = true
);
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C/C++ maximum stack size of program
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Reserved is how much address space to allocate, committed is how much to attach backing storage to. In other words, reserving address space does not mean the memory will be there when you need it. If you never use more than 4K stack, you're not wasting real memor...
Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
... i=[1:inf]
% do something
end
does not (because this one would require allocating infinite memory). See Loren's blog for details.
Also note that you can iterate over cell arrays.
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Where to store global constants in an iOS application?
...0 times and will only create it once. @"foo" is not the same as [[NSString alloc] initWithCString:"foo"].
– Abhi Beckert
Jul 19 '13 at 14:17
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How to check if the string is empty?
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s.strip() allocates a new string, which is pure waste. Use string.isspace()
– Clément
Jun 22 at 15:27
add a ...
How to find an available port?
... you pass 0 as the port number to the constructor of ServerSocket, It will allocate a port for you.
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Fastest hash for non-cryptographic uses?
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fcn time generated hash
crc32: 0.03163 798740135
md5: 0.0731 0dbab6d0c841278d33be207f14eeab8b
sha1: 0.07331 417a9e5c9ac7c52e32727cfd25da99eca9339a80
xor: 0.65218 119
xor2: 0.29301 134217728
add: 0.57841 1105
And the code used to generate this is:
$loops = 100000;
$s...