01-實現圖片按鈕的縮放、動畫效果（block的初步應用），01-block

01-實現圖片按鈕的縮放、動畫效果（block的初步應用），01-block

 1 #import "ViewController.h" 2  3 #define kDelta 60 4  5 @interface ViewController () 6  7 @end 8  9 @implementation ViewController10 11 #pragma mark 封裝動畫效果的代碼12 - (void)btnClickWithBlock:(void (^)())block13 {14     // 實現動畫（漸進變化）15     [UIView beginAnimations:nil context:nil];16     [UIView setAnimationDuration:1.0];17     18     block();19     20     [UIView commitAnimations];21 }22 23 // CGAffineTransform transform24 // 表示空間的形變狀態（旋轉角度、縮放比例）25 #pragma mark 還原為原始狀態26 - (IBAction)reset:(id)sender {27     28     [self btnClickWithBlock:^{29         _btn.transform = CGAffineTransformIdentity;30     }];31 }32 33 #pragma mark 控制按鈕的左右旋轉34 - (IBAction)rotate:(id)sender {35     // tag可以用來區分控制項36     [self btnClickWithBlock:^{37         CGFloat angle = [sender tag]==10 ? 0-M_PI_4 : M_PI_4;38         _btn.transform = CGAffineTransformRotate(_btn.transform, angle);39     }];40 }41 42 #pragma mark 控制按鈕的左右上下移動43 - (IBAction)run:(id)sender {44     45     [self btnClickWithBlock:^{46         CGRect imageFrame = _btn.frame;47         NSInteger tag = [sender tag];48         switch (tag) {49             case 1:50                 imageFrame.origin.y -= kDelta;51                 break;52             case 2:53                 imageFrame.origin.x += kDelta;54                 break;55             case 3:56                 imageFrame.origin.y += kDelta;57                 break;58             case 4:59                 imageFrame.origin.x -= kDelta;60                 break;61                 62             default:63                 break;64         }65         _btn.frame = imageFrame;66     }];67 }68 69 #pragma mark 控制按鈕的縮放70 - (IBAction)zoom:(id)sender {71     72     [self btnClickWithBlock:^{73         CGFloat scale = [sender tag]==15 ? 1.2 : 0.8;74         _btn.transform = CGAffineTransformScale(_btn.transform, scale, scale);75     }];76 }77 @end

 

介面：