NSLayoutContraint

gistfile1.txt

NSArray *myConstraints = [NSLayoutConstraint RCH_constraintsWithCompleteVisualFormat:@"H:|-60-[self]| * V:|[self]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(self, self.superview)];

+ (NSArray *)RCH_constraintsWithCompleteVisualFormat:(NSString *)format options:(NSLayoutFormatOptions)opts metrics:(NSDictionary *)metrics views:(NSDictionary *)views
{
  NSMutableArray *constraints = [NSMutableArray arrayWithCapacity:0];
  NSArray *markers = @[@"H:", @"V:"];
  NSArray *parts = [format componentsSeparatedByString:@"*"];
  for (NSString *formatStringPart in parts) {
    for (NSString *markerString in markers) {
      NSInteger marker = [formatStringPart rangeOfString:markerString].location;
      if (marker != NSNotFound) {
        NSString *trimmedFormatStringPart = [formatStringPart stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:trimmedFormatStringPart options:opts metrics:metrics views:views]];
      }
    }
  }
  return constraints;
}