[iOS]在iOS7 iOS6 修正的方法

sizeWithFont:constrainedToSize:lineBreakMode:

CGSize expectedLabelSize    = [text sizeWithFont:label.font

                                   constrainedToSize:maximumLabelSize

                                       lineBreakMode:label.lineBreakMode];

修改為

CGSize expectedLabelSize    = [text boundingRectWithSize:maximumLabelSize

                                                     options:NSStringDrawingUsesLineFragmentOrigin

                                                  attributes:@{NSFontAttributeName: label.font}

                                                     context:nil].size;

sizeWithFont:

CGSize sizetmp = [text sizeWithFont:font];

iOS7

CGSize sizetmp = [text sizeWithAttributes:@{NSFontAttributeName: font}];

dismissModalViewControllerAnimated:

[self.navigationController dismissModalViewControllerAnimated:YES];

iOS7

[self.navigationController dismissViewControllerAnimated:YES completion:nil];

contentSizeForViewInPopover	preferredContentSize
UITextAttributeTextColor	NSForegroundColorAttributeName
UIStatusBarStyleBlackOpaque UIStatusBarStyleBlackTranslucent	UIStatusBarStyleLightContent

UILineBreakMode vs NSLineBreakMode

UILineBreakModeWordWrap	NSLineBreakByWordWrapping
UILineBreakModeCharacterWrap	NSLineBreakByCharWrapping
UILineBreakModeClip	NSLineBreakByClipping
UILineBreakModeHeadTruncation	NSLineBreakByTruncatingHead
UILineBreakModeTailTruncation	NSLineBreakByTruncatingTail
UILineBreakModeMiddleTruncation	NSLineBreakByTruncatingMiddle