iOS Tutorials (3)--uiimageview, UILabel, UIButton implement a small case

Wait a minute, we're going to do this. See the code below (the code has not been optimized to look at the basic) ( da da: Just seemed to feel very difficult );

viewcontroller.m//03 Picture Browser (code creation)////Created by Sunda on 15/7/1.//Copyright (c) 2015 Sunda. All rights reserved.//#import "ViewController.h" @interface viewcontroller ()/** * Serial number */@property (strong,nonatomic) UILabel *orderlable;/** * Picture */@property (Nonatomic,strong) uiimageview *iconimageview;/** * Picture Description */@property (nonatomic, Strong) UILabel *detailslable;/** * LEFT arrow */@property (Nonatomic,strong) UIButton *leftbutton;/** * RIGHT ARROW */@property (Nona Tomic,strong) UIButton *rightbutton;/** * Count */@property (nonatomic,assign) int index; @end @implementation    viewcontroller-(void) viewdidload {[Super viewdidload];    Build serial number self.orderlable = [[UILabel alloc] init];    Self.orderLable.frame = CGRectMake (0, self.view.frame.size.width,40);    Self.orderLable.text = @ "1/5";    Set text centered self.orderLable.textAlignment = Nstextalignmentcenter;    [Self.view addSubview:self.orderLable];    Build Picture Self.iconimageview = [[Uiimageview alloc] init];    float iconw = 200; FloatIconh = 200;    float icony = Cgrectgetmaxy (self.orderLable.frame) + 20;    float IconX = (self.view.frame.size.width-iconw)/2;    Self.iconImageView.frame = CGRectMake (IconX, Icony, Iconw, Iconh);    Self.iconImageView.image = [UIImage imagenamed:@ "Biaoqingdi"];        [Self.view AddSubview:self.iconImageView];    Build picture Description self.detailslable = [[UILabel alloc] init];    CGFloat detailsy = Cgrectgetmaxy (self.iconImageView.frame) + 20;    Self.detailsLable.frame = CGRectMake (0, Detailsy, self.view.frame.size.width,100);    Self.detailsLable.text = @ "God horse expression";    Self.detailsLable.backgroundColor = [Uicolor Redcolor];    Set text centered self.detailsLable.textAlignment = Nstextalignmentcenter;        [Self.view addSubview:self.detailsLable];    Create left arrow Self.leftbutton = [[UIButton alloc] init];    Self.leftButton.frame = CGRectMake (0, 0, 40, 40);    [Self.leftbutton setbackgroundimage:[uiimage imagenamed:@ "Left_normal"] forstate:uicontrolstatenormal]; [Self.leftbutton SetbackgroundimAge:[uiimage imagenamed:@ "left_highlighted"] forstate:uicontrolstatehighlighted];    Self.leftButton.center = Cgpointmake (SELF.ICONIMAGEVIEW.FRAME.ORIGIN.X/2, SELF.ICONIMAGEVIEW.CENTER.Y);    [Self.view AddSubview:self.leftButton];        [Self.leftbutton addtarget:self Action: @selector (Leftclick) forcontrolevents:uicontroleventtouchupinside];    Create right arrow Self.rightbutton = [[UIButton alloc] init];    Self.rightButton.frame = CGRectMake (0, 0, 40, 40);    [Self.rightbutton setbackgroundimage:[uiimage imagenamed:@ "Right_normal"] forstate:uicontrolstatenormal]; [Self.rightbutton setbackgroundimage:[uiimage imagenamed:@ "right_highlighted"] forstate:uicontrolstatehighlighted    ]; Self.rightButton.center = Cgpointmake (self.view.frame.size.width-self.leftbutton.center.x,    SELF.ICONIMAGEVIEW.CENTER.Y);    [Self.view AddSubview:self.rightButton];        [Self.rightbutton addtarget:self Action: @selector (RightClick) forcontrolevents:uicontroleventtouchupinside]; [Self changeimage];}/** Modifying image data */-(void) changeimage{//Setting the display of all controls above the UI//display ordinal label according to Self.index, image, image description Self.orderLable.text = [Nsstr    ing stringwithformat:@ "%d/%d", Self.index + 1, 5];            Switch (self.index) {Case 0:self.iconimageview.image = [UIImage imagenamed:@ "Biaoqingdi"];            Self.detailsLable.text = @ "expression";        Break            Case 1:self.iconimageview.image = [UIImage imagenamed:@ "Bingli"];            Self.detailsLable.text = @ "Case";        Break            Case 2:self.iconimageview.image = [UIImage imagenamed:@ "Chiniupa"];            Self.detailsLable.text = @ "Eat steak";        Break            Case 3:self.iconimageview.image = [UIImage imagenamed:@ "Danteng"];            Self.detailsLable.text = @ "Egg hurts";        Break            Case 4:self.iconimageview.image = [UIImage imagenamed:@ "Wangba"];            Self.detailsLable.text = @ "Wang Ba";    Break    } self.leftButton.enabled = (Self.index! = 0); Self.rightButton.enabled = (Self.index! = 4);    }/** Left button click Method */-(void) leftclick{NSLog (@ "left");    Self.index--;    [Self changeimage];     }/** Right button click Method */-(void) rightclick{NSLog (@ "right");    Self.index + +;    [Self changeimage]; } @end

is not very simple (da da: Very difficult, decisive to hit the code .... )

Code Optimization one switch optimization

Important I added a comment in the code

viewcontroller.m//03 Picture Browser (code creation)////Created by Sunda on 15/7/1.//Copyright (c) 2015 Sunda. All rights reserved.//#import "ViewController.h" @interface viewcontroller ()/** * Serial number */@property (strong,nonatomic) UILabel *orderlable;/** * Picture */@property (Nonatomic,strong) uiimageview *iconimageview;/** * Picture Description */@property (nonatomic, Strong) UILabel *detailslable;/** * LEFT arrow */@property (Nonatomic,strong) UIButton *leftbutton;/** * RIGHT ARROW */@property (Nona Tomic,strong) UIButton *rightbutton;/** * Count */@property (nonatomic,assign) int index;/** * image list */@property (nonatomic, S Trong) Nsarray *imagelist; @end @implementation viewcontroller//lazy Loading-when needed, in instantiation loaded into memory-(Nsarray *) imagelist{//Only First Call When the getter method is empty, it instantiates and establishes an array if (_imagelist = = nil) {//file represents the full path from the files loaded with the file//bundle-package, read-only nsstring *p        Ath = [[NSBundle mainbundle] pathforresource:@ "ImageData" oftype:@ "plist"];    _imagelist = [Nsarray Arraywithcontentsoffile:path]; } return _imagelist;} -(void)viewdidload {[Super viewdidload];    Build serial number self.orderlable = [[UILabel alloc] init];    Self.orderLable.frame = CGRectMake (0, self.view.frame.size.width,40);    Self.orderLable.text = @ "1/5";    Set text centered self.orderLable.textAlignment = Nstextalignmentcenter;    [Self.view addSubview:self.orderLable];    Build Picture Self.iconimageview = [[Uiimageview alloc] init];    float iconw = 200;    float Iconh = 200;    float icony = Cgrectgetmaxy (self.orderLable.frame) + 20;    float IconX = (self.view.frame.size.width-iconw)/2;    Self.iconImageView.frame = CGRectMake (IconX, Icony, Iconw, Iconh);    Self.iconImageView.image = [UIImage imagenamed:@ "Biaoqingdi"];        [Self.view AddSubview:self.iconImageView];    Build picture Description self.detailslable = [[UILabel alloc] init];    CGFloat detailsy = Cgrectgetmaxy (self.iconImageView.frame) + 20;    Self.detailsLable.frame = CGRectMake (0, Detailsy, self.view.frame.size.width,100);    Self.detailsLable.text = @ "God horse expression"; self.detailslable.bAckgroundcolor = [Uicolor Redcolor];    Set text centered self.detailsLable.textAlignment = Nstextalignmentcenter;        [Self.view addSubview:self.detailsLable];    Create left arrow Self.leftbutton = [[UIButton alloc] init];    Self.leftButton.frame = CGRectMake (0, 0, 40, 40);    [Self.leftbutton setbackgroundimage:[uiimage imagenamed:@ "Left_normal"] forstate:uicontrolstatenormal];    [Self.leftbutton setbackgroundimage:[uiimage imagenamed:@ "left_highlighted"] forstate:uicontrolstatehighlighted];    Self.leftButton.center = Cgpointmake (SELF.ICONIMAGEVIEW.FRAME.ORIGIN.X/2, SELF.ICONIMAGEVIEW.CENTER.Y);    [Self.view AddSubview:self.leftButton];        [Self.leftbutton addtarget:self Action: @selector (Leftclick) forcontrolevents:uicontroleventtouchupinside];    Create right arrow Self.rightbutton = [[UIButton alloc] init];    Self.rightButton.frame = CGRectMake (0, 0, 40, 40);    [Self.rightbutton setbackgroundimage:[uiimage imagenamed:@ "Right_normal"] forstate:uicontrolstatenormal]; [Self.rightbutton setbackgroundimage:[uiimage imagenamed:@ "right_highlighted"] forstate:uicontrolstatehighlighted]; Self.rightButton.center = Cgpointmake (self.view.frame.size.width-self.leftbutton.center.x,    SELF.ICONIMAGEVIEW.CENTER.Y);    [Self.view AddSubview:self.rightButton];        [Self.rightbutton addtarget:self Action: @selector (RightClick) forcontrolevents:uicontroleventtouchupinside]; [Self changeimage];} /** Modifying image data */-(void) changeimage{//Setting the display of all controls above the UI//display ordinal label according to Self.index, image, image description Self.orderLable.text = [Nsstri    ng stringwithformat:@ "%d/%d", Self.index + 1, 5];    Self.iconImageView.image = [UIImage imagenamed:self.imagelist[self.index][@ "name"];    Self.detailsLable.text = self.imagelist[self.index][@ "desc"];    self.leftButton.enabled = (Self.index! = 0);   self.rightButton.enabled = (Self.index! = 4);    }/** Left button click Method */-(void) leftclick{NSLog (@ "left");    Self.index--;    [Self changeimage];     }/** Right button click Method */-(void) rightclick{NSLog (@ "right"); Self.index + +;    [Self changeimage]; } @end

Code optimization Two-control lazy loading

viewcontroller.m//03 Picture Browser (code creation)////Created by Sunda on 15/7/1.//Copyright (c) 2015 Sunda. All rights reserved.//#import "ViewController.h" @interface viewcontroller ()/** * Serial number */@property (strong,nonatomic) UILabel *orderlable;/** * Picture */@property (Nonatomic,strong) uiimageview *iconimageview;/** * Picture Description */@property (nonatomic, Strong) UILabel *detailslable;/** * LEFT arrow */@property (Nonatomic,strong) UIButton *leftbutton;/** * RIGHT ARROW */@property (Nona Tomic,strong) UIButton *rightbutton;/** * Count */@property (nonatomic,assign) int index;/** * image list */@property (nonatomic, S Trong) Nsarray *imagelist; @end @implementation viewcontroller//lazy Loading-when needed, in instantiation loaded into memory-(Nsarray *) imagelist{//Only First Call When the getter method is empty, it instantiates and establishes an array if (_imagelist = = nil) {//file represents the full path from the files loaded with the file//bundle-package, read-only nsstring *p        Ath = [[NSBundle mainbundle] pathforresource:@ "ImageData" oftype:@ "plist"];    _imagelist = [Nsarray Arraywithcontentsoffile:path]; } return _imagelist;} -(UilabEl *) orderlable{if (_orderlable = = nil) {_orderlable = [[UILabel alloc] init];        _orderlable.frame = CGRectMake (0, self.view.frame.size.width,40);        Set text centered _orderlable.textalignment = Nstextalignmentcenter;    [Self.view addsubview:_orderlable];       } return _orderlable;        }-(Uiimageview *) iconimageview{if (_iconimageview = = nil) {_iconimageview = [[Uiimageview alloc] init];        float iconw = 200;        float Iconh = 200;        float icony = Cgrectgetmaxy (self.orderLable.frame) + 20;        float IconX = (self.view.frame.size.width-iconw)/2;        _iconimageview.frame = CGRectMake (IconX, Icony, Iconw, Iconh);    [Self.view Addsubview:_iconimageview];   } return _iconimageview;        }-(UILabel *) detailslable{if (_detailslable = = nil) {_detailslable = [[UILabel alloc] init];       CGFloat detailsy = Cgrectgetmaxy (self.iconImageView.frame) + 20; _detailslable.frame = CGRectMake (0, Detailsy, seLF.VIEW.FRAME.SIZE.WIDTH,100);        Set text multiline display _detailslable.numberoflines = 0;        _detailslable.backgroundcolor = [Uicolor Redcolor];        Set text centered _detailslable.textalignment = Nstextalignmentcenter;    [Self.view addsubview:_detailslable];  } return _detailslable;        }-(UIButton *) leftbutton{if (_leftbutton = = nil) {_leftbutton = [[UIButton alloc] init];        _leftbutton.frame = CGRectMake (0, 0, 40, 40);        [_leftbutton setbackgroundimage:[uiimage imagenamed:@ "Left_normal"] forstate:uicontrolstatenormal];        [_leftbutton setbackgroundimage:[uiimage imagenamed:@ "left_highlighted"] forstate:uicontrolstatehighlighted];        _leftbutton.center = Cgpointmake (SELF.ICONIMAGEVIEW.FRAME.ORIGIN.X/2, SELF.ICONIMAGEVIEW.CENTER.Y);        [Self.view Addsubview:_leftbutton];    [_leftbutton addtarget:self Action: @selector (Leftclick) forcontrolevents:uicontroleventtouchupinside]; } return _leftbutton;} -(UIButton *) rightbutton{IF (_rightbutton = = nil) {_rightbutton = [[UIButton alloc] init];        _rightbutton.frame = CGRectMake (0, 0, 40, 40);        [_rightbutton setbackgroundimage:[uiimage imagenamed:@ "Right_normal"] forstate:uicontrolstatenormal];        [_rightbutton setbackgroundimage:[uiimage imagenamed:@ "right_highlighted"] forstate:uicontrolstatehighlighted]; _rightbutton.center = Cgpointmake (self.view.frame.size.width-self.leftbutton.center.x,        SELF.ICONIMAGEVIEW.CENTER.Y);        [Self.view Addsubview:_rightbutton];    [_rightbutton addtarget:self Action: @selector (RightClick) forcontrolevents:uicontroleventtouchupinside]; } return _rightbutton;}    -(void) viewdidload {[Super viewdidload]; [Self changeimage];} /** Modifying image data */-(void) changeimage{//Setting the display of all controls above the UI//display ordinal label according to Self.index, image, image description Self.orderLable.text = [Nsstri    ng stringwithformat:@ "%d/%d", Self.index + 1, 5];    Self.iconImageView.image = [UIImage imagenamed:self.imagelist[self.index][@ "name"]; SeLf.detailsLable.text = self.imagelist[self.index][@ "desc"];    self.leftButton.enabled = (Self.index! = 0);   self.rightButton.enabled = (Self.index! = 4);    }/** Left button click Method */-(void) leftclick{NSLog (@ "left");    Self.index--;    [Self changeimage];     }/** Right button click Method */-(void) rightclick{NSLog (@ "right");    Self.index + +;    [Self changeimage]; } @end

Code https://github.com/sunda1314520/03-(da da anyway I don't download)

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

iOS Tutorials (3)--uiimageview, UILabel, UIButton implement a small case