Jeff Bailey jeffbailey

jeffbailey / BitsExample

Last active August 29, 2015 13:56

Example of setting, getting, toggling and clearing bits. Source: http://iosdevelopertips.com/c/creating-bit-fields-in-c-and-objective-c.html

	#define BIT_ONE 1
	#define BIT_TWO 2
	#define BIT_THREE 4
	#define BIT_FOUR 8

	int flag = 0;

	// Set bits
	flag \|= BIT_ONE \| BIT_THREE;
	NSLog(@"Bits: %@", [self intToBinaryString:flag]);

jeffbailey / moveButtonImageToRight

Created February 10, 2014 20:08

Move a UIButtonImage to the right hand side to appear after the label

	button.imageEdgeInsets = UIEdgeInsetsMake(0., button.frame.size.width - (image.size.width + 15.), 0., 0.);
	button.titleEdgeInsets = UIEdgeInsetsMake(0., 0., 0., image.size.width);

jeffbailey / UISegmentedControlMask

Created February 17, 2014 17:50

Depending on your background it may be necessary mask the background of a UISegmentedControl in iOS 7.

	CAShapeLayer* mask = [[CAShapeLayer alloc] init];
	mask.frame = CGRectMake(0, 0, segmentedControl.bounds.size.width-1, segmentedControl.bounds.size.height);
	mask.path = [[UIBezierPath bezierPathWithRoundedRect:mask.frame cornerRadius:4] CGPath];
	segmentedControl.layer.mask = mask;

jeffbailey / TARGET_IPHONE_SIMULATOR

Created March 20, 2014 12:40

Test code that only runs in the simulator: TARGET_IPHONE_SIMULATOR

	#ifdef TARGET_IPHONE_SIMULATOR
	// Code to only run in the simulator
	#endif

jeffbailey / HeightForNSString

Created March 30, 2014 11:06

Find the height of a string to dynamically determine the height of a label. New in iOS 7.

	+ (CGSize)labelSizeForString:(NSString *)string fontSize:(CGFloat)fontSize
	{
	return [string boundingRectWithSize:CGSizeMake(DETAIL_TEXT_LABEL_WIDTH, 2000.0) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:fontSize]} context:nil].size;
	}

jeffbailey / WeakStrongDance

Created April 28, 2014 15:27

Example of capturing a weak reference in a block and converting to a strong reference when the block executes.

	__weak typeof(self) weakSelf = self;
	[self doABlockOperation:^{
	__strong typeof(weakSelf) strongSelf = weakSelf;
	if (strongSelf) {
	...
	}
	}];

jeffbailey / gist:f59c737d2a2d9399003e

Created May 2, 2014 18:55

Autolayout Trace command from lldb

po [[UIWindow keyWindow] _autolayoutTrace]

jeffbailey / ResignFirstResponder

Created May 15, 2014 01:02

Generically resign the first responder (i.e., dismiss keyboard)

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:self forEvent:nil]

jeffbailey / Multiline UILabel

Created July 28, 2014 20:11

Multiline UILabel in Interface Builder

	// The first two lines can be set in Interface builder
	self.titleLabel.numberOfLines = 0;
	self.titleLabel.lineBreakMode:NSLineBreakByWordWrapping;

	[self.titleLabel setPreferredMaxLayoutWidth:self.frame.size.width-50];

	// Also in IB, set a constraint on the label so the height it >= the height of a single line

jeffbailey / CreateAndCenterButtonWithAutoLayout

Created August 10, 2014 20:51

Create and center a button using Autolayout

	self.insertTextButton = [UIButton buttonWithType:UIButtonTypeSystem];
	[self.insertTextButton setTitle:@"Press Me" forState:UIControlStateNormal];
	[self.insertTextButton sizeToFit];
	self.insertTextButton.translatesAutoresizingMaskIntoConstraints = NO;
	[self.insertTextButton addTarget:self action:@selector(insertText) forControlEvents:UIControlEventTouchUpInside];
	[self.view addSubview:self.insertTextButton];

	[self.view addConstraint: [NSLayoutConstraint constraintWithItem:self.insertTextButton
	attribute:NSLayoutAttributeCenterX
	relatedBy:NSLayoutRelationEqual