學習IOS開發UI篇--UI知識點總結(一) UIButton/UITextField

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　　UIkit架構下的幾個基本控制項,UIButton,UITextField,UILabel,UIImageView,UIScrollView,UITableView,UITableViewCell,UIPageControl;

　　他們的繼承關係,UILabel,UIImageView,UIScrollView,UITableViewCell,直接繼承自UIView;

　　　　　　　　　UIButton,UITextField,UIPageControl,繼承自UIControl;

　　　　　　　　　UIControl繼承自UIView;

　　補充:在按鈕中添加背景圖片時候設計展開的方法

- (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode NS_AVAILABLE_IOS(6_0); // the interior is resized according to the resizingMode

*** 需要設定按鈕的contentEdgeInsets 屬性 

@property(nonatomic)          UIEdgeInsets contentEdgeInsets ; // default is UIEdgeInsetsZero

　　UIButton:UIButton很常用,屬性雖然簡單,不過初學者常會弄不清楚;

　　在設定屬性的時候需要注意,UIButton中預設有

@property(nonatomic,readonly,retain) UILabel     *titleLabel NS_AVAILABLE_IOS(3_0); (在UIButton不能建立titleLable屬性)

@property(nonatomic,readonly,retain) UIImageView *imageView  NS_AVAILABLE_IOS(3_0);

@property(nonatomic,readonly,retain) NSString *currentTitle;             // normal/highlighted/selected/disabled. can return nil

@property(nonatomic,readonly,retain) UIColor  *currentTitleColor;        // normal/highlighted/selected/disabled. always returns non-nil. default is white(1,1) 

　　在調用方法的時候容易直接用點文法,導致顯示錯誤,正確調用方法應該是

- (void)setTitle:(NSString *)title forState:(UIControlState)state;                // default is nil. title is assumed to be single line

- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state

- (void)setImage:(UIImage *)image forState:(UIControlState)state;          // default is nil. should be same size if different for different states

 

　　UITextFiled: 常用屬性

@property(nonatomic,copy)   NSString               *text;                 // default is nil

@property(nonatomic,copy)   NSAttributedString     *attributedText NS_AVAILABLE_IOS(6_0); // default is nil

@property(nonatomic,retain) UIColor                *textColor;            // default is nil. use opaque black

@property(nonatomic,retain) UIFont                 *font;                 // default is nil. use system font 12 pt

@property(nonatomic)        NSTextAlignment         textAlignment;        // default is NSLeftTextAlignment

@property(nonatomic,retain) UIView              *leftView;        // e.g. magnifying glass (可以在左側預留輸入空白)

@property(nonatomic)        UITextFieldViewMode  leftViewMode;    // sets when the left view shows up. default is UITextFieldViewModeNever

　　代理方法:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField;        // return NO to disallow editing.

- (void)textFieldDidBeginEditing:(UITextField *)textField;           // became first responder

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField;          // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end

- (void)textFieldDidEndEditing:(UITextField *)textField;             // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called 

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;   // return NO to not change text 

- (BOOL)textFieldShouldClear:(UITextField *)textField;               // called when clear button pressed. return NO to ignore (no notifications)

- (BOOL)textFieldShouldReturn:(UITextField *)textField;              // called when ‘return‘ key pressed. return NO to ignore.(在次方法中設定關閉鍵盤)