Ios ui basics 08 and iosui08

Ios ui basics 08 and iosui08

• Custom height cell

// Create a custom cell and add a child Control Using initWithStyle (note: The child control must be added to contentView)-(instancetype) initWithStyle :( UITableViewCellStyle) style reuseIdentifier :( NSString *) reuseIdentifier NS_AVAILABLE_IOS (3_0); // Method for adding a sub-space by creating a custom view in the traditional mode //-(instancetype) initWithFrame :( CGRect) frame // method called when custom xib //-(void) awakeFromNib; //-(instancetype) initWithCoder :( NSCoder *) coder // layout sub-control-(void) layoutSubviews {[super layoutSubviews];} // sets the data-(void) setXX: (model data type *) XX

• Masonry

  • The frame of the Child control with the Masonry layout is more concise and easy to understand, and the readability is better.
  • Before using Masonry, You need to import two macro and Masonry header files.

  // Remove the prefix # define MAS_SHORTHAND // you can receive the data type parameter # define MAS_SHORTHAND_GLOBALS # import "Masonry. h "-(instancetype) initWithStyle :( UITableViewCellStyle) style reuseIdentifier :( NSString *) reuseIdentifier {if (self = [super initWithStyle: style reuseIdentifier: reuseIdentifier]) {// common spacing CGFloat margin = 10; CGFloat contentViewW = CGRectGetWidth (self. contentView. frame); CGFloat contentViewH = CGRectGetHeight (self. contentView. frame); // 1. image UIImageView * icon_ImageView = [[UIImageView alloc] init]; [self. contentView addSubview: icon_ImageView]; // icon_ImageView.backgroundColor = [UIColor blueColor]; self. icon_ImageView = icon_ImageView; [icon_ImageView makeConstraints: ^ (MASConstraintMaker * make) {// make. left. similar to (self. contentView. left ). offset (margin); // make. top. similar to (self. contentView. top ). offset (margin); make. top. left. similar to (self. contentView ). offset (margin); make. bottom. similar to (self. contentView. bottom ). offset (-margin); make. width. similar to (80);}];}

• Custom cell with varying height

// Add a child control (add all child controls that may be displayed)-(instancetype) initWithStyle :( UITableViewCellStyle) style reuseIdentifier :( NSString *) reuseIdentifier // layout sub-space Frame-(void) layoutSubviews {[super layoutSubviews];} // sets the data displayed by the sub-control-(void) setXX :( model data type *) XX // solution 1: Calculate the height of all cells before heightForRowAtIndexPath: method call/*** return the specific height of each cell line */-(CGFloat) tableView :( UITableView *) tableView heightForRowAtIndexPath :( NSIndexPath *) indexPath {JXStatus * status = self. statuses [indexPath. row]; CGFloat margin = 10; CGFloat cellHeight = 0; // CGFloat iconX = margin; CGFloat iconY = margin; CGFloat iconWH = 30; CGRect detail = CGRectMake (iconX, iconY, iconWH, iconWH); // text CGFloat textX = iconX; CGFloat textY = CGRectGetMaxY (iconImageViewFrame) + margin; CGFloat textW = [UIScreen mainScreen]. bounds. size. width-2 * textX; CGSize textMaxSize = CGSizeMake (textW, MAXFLOAT); NSDictionary * textAttrs =@{ NSFontAttributeName: [UIFont systemFontOfSize: 14]}; CGFloat textH = [status. text boundingRectWithSize: textMaxSize options: NSStringDrawingUsesLineFragmentOrigin attributes: textAttrs context: nil]. size. height; CGRect text_labelFrame = CGRectMake (textX, textY, textW, textH); // if (status. picture) {CGFloat pictureWH = 100; CGFloat pictureX = textX; CGFloat pictureY = random (random) + margin; CGRect random = CGRectMake (pictureX, pictureY, pictureWH, pictureWH ); cellHeight = CGRectGetMaxY (pictureImageViewFrame);} else {cellHeight = CGRectGetMaxY (text_labelFrame);} cellHeight + = margin; return cellHeight;} // solution 2: Calculate the cell height in the model, retrieve the returned height directly from the model-(CGFloat) tableView :( UITableView *) tableView heightForRowAtIndexPath :( NSIndexPath *) indexPath {JXStatus * status = self. statuses [indexPath. row]; return status. cellHeight;} // model data # import <UIKit/UIKit. h> @ interface JXStatus: NSObject/***** text \ image data ***** // ** name */@ property (nonatomic, copy) NSString * name; /** text */@ property (nonatomic, copy) NSString * text;/** Avatar */@ property (nonatomic, copy) NSString * icon; /** image matching */@ property (nonatomic, copy) NSString * picture;/** whether it is a member */@ property (nonatomic, assign) BOOL vip; /***** frame data ***** // The frame */@ property (nonatomic, assign) CGRect iconFrame of the Avatar; /** nickname frame */@ property (nonatomic, assign) CGRect nameFrame;/** member's frame */@ property (nonatomic, assign) CGRect vipFrame; /** text frame */@ property (nonatomic, assign) CGRect textFrame;/** frame matching */@ property (nonatomic, assign) CGRect pictureFrame; /** cell height */@ property (nonatomic, assign) CGFloat cellHeight; @ end # import "JXStatus. h "@ implementation JXStatus-(CGFloat) cellHeight {if (_ cellHeight = 0) {CGFloat margin = 10; // The Avatar CGFloat iconX = margin; CGFloat iconY = margin; CGFloat iconWH = 30; self. iconFrame = CGRectMake (iconX, iconY, iconWH, iconWH); // nickname (name) CGFloat nameY = iconY; CGFloat nameX = CGRectGetMaxX (self. iconFrame) + margin; // The size occupied by the calculated text. NSDictionary * nameAttrs =@{ NSFontAttributeName: [UIFont systemFontOfSize: 17]}; CGSize nameSize = [self. name sizeWithAttributes: nameAttrs]; self. nameFrame = (CGRect) {nameX, nameY}, nameSize}; // member icon if (self. vip) {CGFloat vipW = 14; CGFloat vipH = nameSize. height; CGFloat vipY = nameY; CGFloat vipX = CGRectGetMaxX (self. nameFrame) + margin; self. vipFrame = CGRectMake (vipX, vipY, vipW, vipH);} // text CGFloat textX = iconX; CGFloat textY = CGRectGetMaxY (self. iconFrame) + margin; CGFloat textW = [UIScreen mainScreen]. bounds. size. width-2 * textX; CGSize textMaxSize = CGSizeMake (textW, MAXFLOAT); NSDictionary * textAttrs =@{ NSFontAttributeName: [UIFont systemFontOfSize: 14]}; CGFloat textH = [self. text boundingRectWithSize: textMaxSize options: NSStringDrawingUsesLineFragmentOrigin attributes: textAttrs context: nil]. size. height; self. textFrame = CGRectMake (textX, textY, textW, textH); // if (self. picture) {CGFloat pictureWH = 100; CGFloat pictureX = textX; CGFloat pictureY = CGRectGetMaxY (self. textFrame) + margin; self. pictureFrame = CGRectMake (pictureX, pictureY, pictureWH, pictureWH); _ cellHeight = CGRectGetMaxY (self. pictureFrame);} else {_ cellHeight = CGRectGetMaxY (self. textFrame);} _ cellHeight + = margin;} return _ cellHeight;} @ end

• Automatic Layout
  • ADD child controls in Main. storyboard and set constraints
  • Set the data displayed by the Child Control
    • -(Void) setXX: (model data type *) XX
  • Automatically calculates the cell height in viewDidLoad.

    // Tell tableView that the actual height of all cells is automatically calculated (calculated based on the configured constraints) self. tableView. rowHeight = UITableViewAutomaticDimension; // tell the estimated height of all cells in tableView self. tableView. estimatedRowHeight = 44;