大约有 2,193 项符合查询结果（耗时：0.0088秒） [XML]
Creating a blurring overlay view
...tStyleDark];
UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
//always fill the view
blurEffectView.frame = self.view.bounds;
blurEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.v...
Placeholder in UITextView
...at const UI_PLACEHOLDER_TEXT_CHANGED_ANIMATION_DURATION = 0.25;
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
#if __has_feature(objc_arc)
#else
[_placeHolderLabel release]; _placeHolderLabel = nil;
[_placeholderColor release]; _placeholderColor = nil;
...
Why is @autoreleasepool still needed with ARC?
...now there's a ton of objects ready to be cleared out, you have a loop that allocates a bunch of temp objects, so you "know" (or Instruments might tell you :) that adding a release pool around the loop would be a good idea.
– Graham Perks
Jan 31 '12 at 21:28
...
When NOT to use yield (return) [duplicate]
...e O(n) in stack space. It is O(h) in heap space because each enumerator is allocated on the heap. (On implementations of C# I'm aware of; a conforming implementation might have other stack or heap space characteristics.)
But iterating a tree can be O(n) in time and O(1) in stack space. You can wr...
Read stream twice
... = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes array instead of allocating possibly large buffer (if maxBytesToRead is large)
// NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);"
...
iOS 7 TextKit - How to insert images inline with text?
...
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"like after"];
NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
textAttachment.image = [UIImage imageNamed:@"whatever.png"];
NSAttributedString *attrStringWithImage = [NSAttributedS...
“static const” vs “#define” vs “enum”
...ll appear in the object code as part of the instructions rather than being allocated storage in the data segment or in heap or on the stack. You'll have some space allocated for the static const int, but the compiler might optimize it away if you don't take an address.
– Jonat...
How do I check if a list is empty?
...ient if the array is of a significant size. Also, typically, you would not allocate memory for an empty array (pointer remains null), so it makes no sense to attempt to get its length. I am not saying that len(a) == 0 is not a good way of doing it, it just does not scream 'C' to me when I see it.
...
Suppress warning CS1998: This async method lacks 'await'
... Median | Min | Max | Rank | Gen 0 | Gen 1 | Gen 2 | Allocated |
--------------- |----- |-------- |-------------:|------------:|------------:|-------------:|-------------:|-------------:|-----:|-------:|-------:|-------:|----------:|
CompletedAwait | Clr | Clr | 95.253...
Why would you use an ivar?
...ly common in partially constructed states -- in your initializers and in dealloc, it's best to use direct access. You may also find this common in the implementations of an accessor, a convenience constructor, copy, mutableCopy, and archiving/serialization implementations.
It's also more frequent as...